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Adzuki bean
Adzuki bean
Adzuki bean
Adzuki bean
Adzuki bean
Adzuki bean
Adzuki bean
Vigna angularis
Also known as : Red mung bean
The popular red bean paste filling found in various food and pastries in some East Asian countries is made from the adzuki bean, an annual vine. Because of its bean's naturally sweet and nutty flavor, this plant is grown as an edible crop. Seeds are used as medicine in China to treat a variety of diseases.
Hardiness Zones
Hardiness Zones
10 to 12
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care guide

Care Guide for Adzuki bean

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Soil Care
Soil Care
Clay, Slightly acidic, Neutral, Slightly alkaline
Details on Soil Care Soil Care
Ideal Lighting
Ideal Lighting
Full sun, Partial sun
Details on Sunlight Requirements Ideal Lighting
Ideal Temperature
Ideal Temperature
10 to 12
Details on Temperature Ideal Temperature
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Adzuki bean
Sunlight
Sunlight
Full sun
Hardiness Zones
Hardiness Zones
10 to 12
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Questions About Adzuki bean

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Watering Watering Watering
Sunlight Sunlight Sunlight
Temperature Temperature Temperature
Fertilizing Fertilizing Fertilizing
What is the best way to water my Adzuki bean?
Not only does the Adzuki bean have certain preferences regarding how much water it receives, but it also cares deeply about how you provide that water. In fact, if you don't use the proper watering technique, you risk harming your tomatoes. The best way to water Adzuki bean is to apply the water directly to the soil in a slow and gentle manner. You should not pour all of the water into the soil at once, and you should not do overhead watering for your Adzuki bean. Although you should water slowly, you should also water deeply to ensure that all of the soil in which your Adzuki bean grows is sufficiently moist.
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What should I do if I water my Adzuki bean too much or too little?
If you find that you have overwatered your Adzuki bean and you are concerned about the associated risk of disease, you should intervene immediately. Often the best approach for an overwatered Adzuki bean is to uproot it from its current growing location. Once the plant is out of the ground, you can allow its roots to dry a bit before planting it in a new growing location. Ensure that the new growing location has soil with good drainage. If you grow in pots, you may also want to move your plant to a pot with more or larger drainage holes. In the case of underwatering, all you will need to do is increase the frequency with which you supply water to your plant.
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How often should I water my Adzuki bean?
Overall, Adzuki bean requires a significant amount of water throughout the growing season. To meet that high water need, you'll need to water early and often throughout the spring and summer. During the earlier parts of the growing season, you should water your Adzuki bean about once or twice per week. As the season progresses, you should increase your watering frequency. You may need to water it twice per day or more during summer, depending on the weather. After your Adzuki bean have gone through their major seasonal growth phases, you can reduce the frequency of your watering to about once per week until the end of the growing season.
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How much water does my Adzuki bean need?
Since Adzuki bean are incredibly popular, with many professional and amateur gardeners growing them successfully, we have a pretty clear idea of how to care for these plants. That understanding includes specific knowledge about the precise volume of water an average Adzuki bean should receive. Generally, Adzuki bean will require about 1 - 1.5 inches of water per week. That volume should be dispersed evenly through your weekly watering. As the weather gets warmer, you may need to supply more water, but in most cases, two inches per week is a good baseline amount.
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How can I tell if i'm watering my Adzuki bean enough?
Underwatering and overwatering can both occur as problems for your Adzuki bean, and both these problems can manifest with similar symptoms. For example, foliage discoloration and wilting can both result from either overwatering or underwatering. When your Adzuki bean is underwatered, its leaves will be curling and drooping at the beginning. You will see a bunch of leaves turn less vigorous. Underwatering is also likely to cause stunted growth and poor overall development as both the flowers and this plant require a high amount of water. Overwatering is more likely to lead to disease, including rot. Overwatering may also lead to unpleasant smells rising from your plant's soil. The symptoms of underwatering will show up quicker than overwatering. Overwatering can also be evident in soil conditions. Mainly, if you notice a lot of standing water or waterlogged soils, overwatering is likely to occur.
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How should I water my Adzuki bean through the seasons?
As alluded to above, your Adzuki bean's water needs will repeatedly change throughout the seasons. During most of spring and summer, you should water your Adzuki bean about once every week. As the heat of summer arrives, you should plan to increase your watering frequency to once or twice per day. In the late summer and fall, towards the end of the harvest period, you can reduce your watering frequency to about once per week. After harvest has ended, you can cease watering as your Adzuki bean has reached the end of its life cycle and will require no further soil moisture. The maintenance schedule of Adzuki bean will require you to alter the amount of water you provide depending on the plant's current growth stage. Early on, especially if you grow your Adzuki bean from seeds, you'll need to provide water often enough to maintain consistent soil moisture, which encourages root development. When the plant becomes old enough to produce flowers, it will likely need even more water. During the fruit development growth stage, your Adzuki bean will likely need the most water out of any growth period, at times requiring water more than twice per day. Following that phase, the water needs of Adzuki bean will decline significantly.
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What's the difference between watering Adzuki bean indoors and outdoors?
Whether you grow Adzuki bean indoors or outdoors can also play a role in how you water them. Adzuki bean that grows outdoors may receive water from natural rainfall, which will reduce the amount of supplemental water you should supply. However, it is incredibly rare for rainfall to adequately replace your watering entirely. Plants that grow indoors, along with any Adzuki bean that grows in a container, will need to be watered more frequently than those that grow in the ground outdoors. If you choose this route, please make sure that the plant gets enough water by checking the soil moisture within your pot often to keep your Adzuki bean healthy.
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Key Facts About Adzuki bean

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Attributes of Adzuki bean

Lifespan
Annual
Plant Type
Herb, Vine
Bloom Time
Summer
Plant Height
61 cm to 91 cm
Flower Size
2.5 cm to 5 cm
Flower Color
Yellow
Purple
Leaf type
Deciduous
Ideal Temperature
20 - 38 ℃

Scientific Classification of Adzuki bean

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pests

Common Pests & Diseases About Adzuki bean

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Common issues for Adzuki bean based on 10 million real cases
Brown spot
Brown spot Brown spot
Brown spot
This infection can cause brown spots or patches to appear on the plant.
Solutions: In minor cases of brown spot, there isn’t any need to treat the disease. However, if much of the foliage is affected and defoliation occurs, the plant will benefit from getting rid of the infection. It is recommended to start by applying organic treatment options, working up to the more potent synthetic, chemical fungicides if necessary. Organic options won’t kill the fungus, but will prevent it from spreading. Dissolve ½ teaspoon of baking soda and one teaspoon of liquid soap in a gallon of water. Using a spray bottle, spray on tops and bottoms of leaves until the mixture drips off. Repeat every two weeks until existing spots stop enlarging and new spots no longer appear. Spray a copper-based fungicidal soap on the leaves, coating the top and bottom leaf surfaces. Reapply as directed on the product label. Copper penetrates the leaf surface and prevents germination of spores so the fungus cannot spread. Apply an all-purpose fungicide to the entire plant, following the label instructions carefully.
Aged yellow and dry
Aged yellow and dry Aged yellow and dry
Aged yellow and dry
Natural aging can cause leaves to turn yellow and dry out.
Solutions: If the yellowing and drying of leaves and flowers is a natural progression due to age, nothing can be done to slow or stop the process. Once hormones within the plant begin the process of senescence, it’s irreversible.
Sap-sucking insects
Sap-sucking insects Sap-sucking insects
Sap-sucking insects
Sap-sucking insects can create dense clusters of small yellow or white spots on the leaves.
Solutions: Sap-sucking insects can be hard to spot, as they are often small and attach to the undersides of plant leaves. If you see signs of an infestation, follow these steps to eradicate it. Hand-pick bugs and remove eggs: Inspect your plants for insects and drop any you find in a container of soapy water. Look carefully at the undersides of plant leaves and squish any egg clusters you find. Use Insecticide: Targeted spraying can take out sap-sucking insects. Small infestations can be controlled with insecticidal soap, though larger outbreaks might require a stronger spray. Introduce natural predators: Many insects, including ladybugs and praying mantises, love to feast on sap-suckers. You can purchase them at garden stores and release them near infected plants, or encourage wild ones by creating habitat space.
Leaf miners
Leaf miners Leaf miners
Leaf miners
Leaf miners scar the leaves with curved white streaks or rounded white spots with brown centers.
Solutions: Leaf miners, although relatively harmless at first, can quickly multiply and devastate your plants in the coming weeks. For severe cases: Spray an organic insecticide. For an organic solution, spray a diluted mixture of azadirachtin, a compound derived from neem seeds, above and below leaves. Spray a synthetic insecticide. Spray a product that contains spinosad, such as Entrust, making sure to cover all sides of the leaves. Introduce beneficial insects. Introduce beneficial insects that eat leaf miners, such as parasitic wasps or Syrphid flies. For less severe cases: Prune infected tissue. Remove and dispose of leaves that have any sign of leaf miner damage.
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Brown spot
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Brown spot
This infection can cause brown spots or patches to appear on the plant.
Overview
Overview
Discolored spots on the foliage of plants are one of the most common disease problems people observe. These spots are caused by fungal and bacterial diseases, with most infections related to a fungal pathogen.
Brown spot can occurs on all houseplants, flowering ornamentals, vegetable plants, and leaves of trees, bushes, and shrubs. No plants are resistant to it, and the problem is worse in warm, wet environments. It can occur at any point in the life stage as long as leaves are present.
Small brownish spots appear on the foliage and enlarge as the disease progresses. In severe cases, the plant or tree is weakened when the lesions interrupt photosynthesis or cause defoliation.
Symptom Analysis
Symptom Analysis
In most cases, brown spot only affects a small percentage of the whole plant, appearing on a small amount of the leaves. A small infection only puts minor stress on the plant. However, if left untreated and the disease progresses over numerous seasons, it will severely impact the health and productivity of the infected specimen.
  • Sporulation begins (reproduction of the fungal spores), and tiny spots appear on leaves.
  • Placement is often random and scattered as diseases are spread through raindrops.
  • May appear on lower leaves and the interior of the plant where humidity is higher.
  • Brown spots enlarge and grow large enough to touch neighboring spots to form a more prominent blotch.
  • Leaf margins may turn yellow.
  • Tiny black dots (fruiting bodies of the fungi) appear in the dead spots.
  • Blotches grow in size until the entire leaf is brown.
  • The leaf falls off the plant.
Severe Symptoms
  • Partial or complete premature defoliation
  • Reduced growth
  • Increased susceptibility to pests and other diseases
Disease Cause
Disease Cause
Brown spot, or leaf spot, is a common descriptive term given to several diseases affecting the leaves of plants and trees. Around 85% of diseases exhibiting leaf spots are due to fungus or fungus-like organisms. Sometimes brown spot is caused by a bacterial infection, or insect activity with similar symptoms.
When conditions are warm and the leaf surfaces are wet, fungal spores being transported by wind or rain land on the surface and cling to it. They do not rupture the cell walls but grow in the space between the plant plasma membrane and the plant cell wall. As the spores reproduce, they release toxins and enzymes that cause necrotic spots (i.e., dead tissue) on the leaves, allowing the fungi to consume the products released when the cells degrade.
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Aged yellow and dry
plant poor
Aged yellow and dry
Natural aging can cause leaves to turn yellow and dry out.
Overview
Overview
Regardless of the type of plant or where it is grown, at some point, it will begin to aged yellow and dry. This is a natural, unavoidable process that happens when the plant has completed all of the steps in its life.
Annual plants go through this process at the end of a single growing season. Perennial plants live for multiple years, if not tens or hundreds of years, but will still ultimately exhibit these symptoms.
Symptom Analysis
Symptom Analysis
When plants have progressed through their natural developmental stages and are nearing the end of their lifecycle, they begin showing signs of decline. Leaves will start to yellow and droop, and over time they turn papery brown and dry.
Once completely dry, the leaves begin to fall from the plant until the entire plant has dried out.
Disease Cause
Disease Cause
At the end of its life, genetic coding within the plant increases the production of ethylene, a phytohormone that controls senescence or natural aging and death. Cell division stops, and the plant begins catabolizing resources to use in other parts of the plant.
As this happens, the tissues begin yellow and drying until the entire plant is desiccated and perishes.
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Sap-sucking insects
plant poor
Sap-sucking insects
Sap-sucking insects can create dense clusters of small yellow or white spots on the leaves.
Symptom Analysis
Symptom Analysis
Your plant has developed tiny yellowish spots scattered across the leaves that look like mold or mildew. If these marks won't wipe off, they are likely caused by sap-sucking insects like aphids, squash bugs, scale bugs, leafhoppers, whiteflies, mites, mealybugs, and more.
Each of these pests uses mouthparts to pierce leaf tissues and suck the sap. uses mouthparts to pierce leaf tissues and suck the sap. Signs of damage are difficult to spot at first, but a large infestation can quickly compromise the whole plant. You're most likely to see sap-sucking insects during the hottest months because plants make easier targets when already weakened from heat or drought.
Though sap-sucking insects are unlikely to kill your plant on their own, they can severely weaken it and make it more susceptible to disease. They may also spread viruses from one plant to another as they feed.
Solutions
Solutions
Sap-sucking insects can be hard to spot, as they are often small and attach to the undersides of plant leaves. If you see signs of an infestation, follow these steps to eradicate it.
  1. Hand-pick bugs and remove eggs: Inspect your plants for insects and drop any you find in a container of soapy water. Look carefully at the undersides of plant leaves and squish any egg clusters you find.
  2. Use Insecticide: Targeted spraying can take out sap-sucking insects. Small infestations can be controlled with insecticidal soap, though larger outbreaks might require a stronger spray.
  3. Introduce natural predators: Many insects, including ladybugs and praying mantises, love to feast on sap-suckers. You can purchase them at garden stores and release them near infected plants, or encourage wild ones by creating habitat space.
Prevention
Prevention
Healthy plants are less likely to suffer from sap-sucker attacks. Keep them fortified with fertilizer and the right amounts of water and sunlight. Plants that receive excess nitrogen are also more susceptible to attack, so don’t overfertilize. You should also remove weeds and tall grasses surrounding your outdoor plants so as not to create habitat space for the pests.
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Leaf miners
plant poor
Leaf miners
Leaf miners scar the leaves with curved white streaks or rounded white spots with brown centers.
Symptom Analysis
Symptom Analysis
The leaves on your plants are showing clear/white trails, which appear like parts have been hollowed out. These trails are narrow at first and become wide patches over time. In some cases, leaves will be completely hollow and dry on the plant. As the name suggests, leaf miners are responsible.
Leaf miners are most common in the early spring when they begin to hatch and reproduce. They are tiny 1/16th inch larvae that resemble small grains of rice. The larvae are found inside leaves. The adult stage, a fly, lays eggs in between the layers of a leaf. When the eggs hatch, the larvae eat the tender nutritious inner leaves.
Solutions
Solutions
Leaf miners, although relatively harmless at first, can quickly multiply and devastate your plants in the coming weeks.
For severe cases:
  1. Spray an organic insecticide. For an organic solution, spray a diluted mixture of azadirachtin, a compound derived from neem seeds, above and below leaves.
  2. Spray a synthetic insecticide. Spray a product that contains spinosad, such as Entrust, making sure to cover all sides of the leaves.
  3. Introduce beneficial insects. Introduce beneficial insects that eat leaf miners, such as parasitic wasps or Syrphid flies.
For less severe cases:
  1. Prune infected tissue. Remove and dispose of leaves that have any sign of leaf miner damage.
Prevention
Prevention
Although leaf miners are easy to control, preventing them is ideal. Our recommendations are:
  1. Physically exclude adults. Cover plants with floating row covers as soon as you put them in the ground.
  2. Remove weeds and debris. Keep your garden weeded to lower the number of plants leaf miners can feed and breed on.
  3. Avoid introducing infected plants. Carefully inspect new plants for leaf miners before adding them to your garden or home.
  4. Avoid broad-spectrum pesticides. Leaf miners can usually be controlled by natural predatory insects. Do not apply broad-spectrum insecticides that could harm these beneficial insects.
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distribution

Distribution of Adzuki bean

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Habitat of Adzuki bean

Cultivated land

Distribution Map of Adzuki bean

Adzuki bean is a plant natively found in East Asia and regions of Northeast Asia. It has also been introduced and cultivated in parts of South Asia, Southeast Asia, East Africa, Central America, and the Caribbean. Adzuki bean has adapted well outside its native range, establishing a presence in a variety of climates and being cultivated in a number of regions where it was introduced.
distribution map
Native
Cultivated
Invasive
Potentially invasive
Exotic
No species reported
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More Info on Adzuki Bean Growth and Care

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Basic Care Guide
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Lighting
Full sun
Adzuki bean thrives under intensively exposed light settings, which significantly propels its vigorous growth and health. Although it can endure light shade, it could risk suboptimal growth. The plant originates from habitats receiving abundant light. Insufficient or excessive light exposure often hampers the plant's optimal state.
Best Sunlight Practices
Transplant
1-2 feet
The optimal period for transplanting adzuki bean is during the S2-S4 season, commonly better explained as late spring to early summer, due to adzuki bean's sensitivity to frost. Ideally, choose a location with full sun and well-drained soil. Water regularly after transplanting to encourage healthy root development.
Transplant Techniques
Temperature
5 - 43 ℃
Adzuki bean originates from environments with temperatures ranging from 68 to 100.4°F (20 to 38℃). It thrives in these conditions, making it a warm-season crop. Seasonal temperature adjustments may be necessary if local conditions diverge significantly.
Temp for Healthy Growth
Feng shui direction
South
The adzuki bean is harmonious with a southern facing direction. Within Feng Shui practice, south symbolizes fame, reputation, and recognition, which the adzuki bean may stimulate due to its red beans symbolizing fire, an element associated with the south. Yet, the interpretations can differ based on individual perspectives in relation to Feng Shui.
Fengshui Details
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Plants Related to Adzuki bean

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Spanish dagger
Spanish dagger
Spanish dagger (Yucca gloriosa) is a flowering evergreen shrub that originated in the United States southeastern region. It naturally grows along sand dunes, but has become very popularly cultivated as a garden plant used for landscaping. Other names for spanish dagger are Roman candle, Lord's candlestick, and Sea Islands yucca.
Exploding cucumber
Exploding cucumber
An unusual plant, exploding cucumber is aptly named. When ripe, this plant shoots out a stream of liquid containing its seeds. Although it looks like a small cucumber, this plant is poisonous.
Evergreen huckleberry
Evergreen huckleberry
A prized fruit in summer, evergreen huckleberry is native to the Western Pacific United States and British Columbia. The small, round fruit is similar in taste to a blueberry but with a more intense and sweet flavor. This makes them a perfect choice for jams, jellies, and syrups. The berries are also a favorite of birds and other wildlife, including bears.
Mountain soursop
Mountain soursop
Mountain soursop (Annona montana) is an evergreen tropical fruit tree that will grow from 2.5 to 14 m tall. It is drought-tolerant and will grow in dry conditions. Native to Central America. Produces round, edible green fruit that have a fragrant aroma but a sour and bitter flavor.
Erect Prickly Pear
Erect Prickly Pear
Erect Prickly Pear is an upright-growing succulent shrub native to the Caribbean. The flowers are vibrant yellow, but sometimes have rosy or crimson-colored patterns on the exterior petals. This variety of cactus has leaf-like turquoise stems called cladodes. It is hairless but covered with small prickly bristles. The unripe fruits are green, but turn to plum as they ripen.
Blushing bride
Blushing bride
Blushing bride (Serruria florida) is a large flower with origins in South Africa. It is also known by the name blushing bride. It grows in dry, drained soil under full sunlight. Natural populations grow almost exclusively in the Hottentots Holland Mountain Range near South Africa's southern coast, but blushing bride is cultivated in gardens around the world.
Cape jasmine
Cape jasmine
Gardenia jasminoides is an evergreen shrub with unique, glossy evergreen leaves and stunning flowers. The sophisticated, matte white flowers are often used in bouquets. The exceptional beauty of this ornamental plant has made it a popular and highly appreciated plant amongst gardeners and horticulturalists.
Golden pothos
Golden pothos
The golden pothos (Epipremnum aureum) is a popular houseplant that is commonly seen in Australia, Asia, and the West Indies. It goes by many nicknames, including "devil's ivy", because it is so hard to kill and can even grow in low light conditions. Golden pothos has poisonous sap, so it should be kept away from pets and children.
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Related Plants
Adzuki bean
Adzuki bean
Adzuki bean
Adzuki bean
Adzuki bean
Adzuki bean
Adzuki bean
Vigna angularis
Also known as: Red mung bean
The popular red bean paste filling found in various food and pastries in some East Asian countries is made from the adzuki bean, an annual vine. Because of its bean's naturally sweet and nutty flavor, this plant is grown as an edible crop. Seeds are used as medicine in China to treat a variety of diseases.
Hardiness Zones
Hardiness Zones
10 to 12
more
care guide

Care Guide for Adzuki bean

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Questions About Adzuki bean

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Watering Watering Watering
Sunlight Sunlight Sunlight
Temperature Temperature Temperature
Fertilizing Fertilizing Fertilizing
What is the best way to water my Adzuki bean?
more
What should I do if I water my Adzuki bean too much or too little?
more
How often should I water my Adzuki bean?
more
How much water does my Adzuki bean need?
more
How can I tell if i'm watering my Adzuki bean enough?
more
How should I water my Adzuki bean through the seasons?
more
What's the difference between watering Adzuki bean indoors and outdoors?
more
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Key Facts About Adzuki bean

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Attributes of Adzuki bean

Lifespan
Annual
Plant Type
Herb, Vine
Bloom Time
Summer
Plant Height
61 cm to 91 cm
Flower Size
2.5 cm to 5 cm
Flower Color
Yellow
Purple
Leaf type
Deciduous
Ideal Temperature
20 - 38 ℃
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Scientific Classification of Adzuki bean

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pests

Common Pests & Diseases About Adzuki bean

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Common issues for Adzuki bean based on 10 million real cases
Brown spot
Brown spot Brown spot Brown spot
This infection can cause brown spots or patches to appear on the plant.
Solutions: In minor cases of brown spot, there isn’t any need to treat the disease. However, if much of the foliage is affected and defoliation occurs, the plant will benefit from getting rid of the infection. It is recommended to start by applying organic treatment options, working up to the more potent synthetic, chemical fungicides if necessary. Organic options won’t kill the fungus, but will prevent it from spreading. Dissolve ½ teaspoon of baking soda and one teaspoon of liquid soap in a gallon of water. Using a spray bottle, spray on tops and bottoms of leaves until the mixture drips off. Repeat every two weeks until existing spots stop enlarging and new spots no longer appear. Spray a copper-based fungicidal soap on the leaves, coating the top and bottom leaf surfaces. Reapply as directed on the product label. Copper penetrates the leaf surface and prevents germination of spores so the fungus cannot spread. Apply an all-purpose fungicide to the entire plant, following the label instructions carefully.
Learn More About the Brown spot more
Aged yellow and dry
Aged yellow and dry Aged yellow and dry Aged yellow and dry
Natural aging can cause leaves to turn yellow and dry out.
Solutions: If the yellowing and drying of leaves and flowers is a natural progression due to age, nothing can be done to slow or stop the process. Once hormones within the plant begin the process of senescence, it’s irreversible.
Learn More About the Aged yellow and dry more
Sap-sucking insects
Sap-sucking insects Sap-sucking insects Sap-sucking insects
Sap-sucking insects can create dense clusters of small yellow or white spots on the leaves.
Solutions: Sap-sucking insects can be hard to spot, as they are often small and attach to the undersides of plant leaves. If you see signs of an infestation, follow these steps to eradicate it. Hand-pick bugs and remove eggs: Inspect your plants for insects and drop any you find in a container of soapy water. Look carefully at the undersides of plant leaves and squish any egg clusters you find. Use Insecticide: Targeted spraying can take out sap-sucking insects. Small infestations can be controlled with insecticidal soap, though larger outbreaks might require a stronger spray. Introduce natural predators: Many insects, including ladybugs and praying mantises, love to feast on sap-suckers. You can purchase them at garden stores and release them near infected plants, or encourage wild ones by creating habitat space.
Learn More About the Sap-sucking insects more
Leaf miners
Leaf miners Leaf miners Leaf miners
Leaf miners scar the leaves with curved white streaks or rounded white spots with brown centers.
Solutions: Leaf miners, although relatively harmless at first, can quickly multiply and devastate your plants in the coming weeks. For severe cases: Spray an organic insecticide. For an organic solution, spray a diluted mixture of azadirachtin, a compound derived from neem seeds, above and below leaves. Spray a synthetic insecticide. Spray a product that contains spinosad, such as Entrust, making sure to cover all sides of the leaves. Introduce beneficial insects. Introduce beneficial insects that eat leaf miners, such as parasitic wasps or Syrphid flies. For less severe cases: Prune infected tissue. Remove and dispose of leaves that have any sign of leaf miner damage.
Learn More About the Leaf miners more
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Brown spot
plant poor
Brown spot
This infection can cause brown spots or patches to appear on the plant.
Overview
Overview
Discolored spots on the foliage of plants are one of the most common disease problems people observe. These spots are caused by fungal and bacterial diseases, with most infections related to a fungal pathogen.
Brown spot can occurs on all houseplants, flowering ornamentals, vegetable plants, and leaves of trees, bushes, and shrubs. No plants are resistant to it, and the problem is worse in warm, wet environments. It can occur at any point in the life stage as long as leaves are present.
Small brownish spots appear on the foliage and enlarge as the disease progresses. In severe cases, the plant or tree is weakened when the lesions interrupt photosynthesis or cause defoliation.
Symptom Analysis
Symptom Analysis
In most cases, brown spot only affects a small percentage of the whole plant, appearing on a small amount of the leaves. A small infection only puts minor stress on the plant. However, if left untreated and the disease progresses over numerous seasons, it will severely impact the health and productivity of the infected specimen.
  • Sporulation begins (reproduction of the fungal spores), and tiny spots appear on leaves.
  • Placement is often random and scattered as diseases are spread through raindrops.
  • May appear on lower leaves and the interior of the plant where humidity is higher.
  • Brown spots enlarge and grow large enough to touch neighboring spots to form a more prominent blotch.
  • Leaf margins may turn yellow.
  • Tiny black dots (fruiting bodies of the fungi) appear in the dead spots.
  • Blotches grow in size until the entire leaf is brown.
  • The leaf falls off the plant.
Severe Symptoms
  • Partial or complete premature defoliation
  • Reduced growth
  • Increased susceptibility to pests and other diseases
Disease Cause
Disease Cause
Brown spot, or leaf spot, is a common descriptive term given to several diseases affecting the leaves of plants and trees. Around 85% of diseases exhibiting leaf spots are due to fungus or fungus-like organisms. Sometimes brown spot is caused by a bacterial infection, or insect activity with similar symptoms.
When conditions are warm and the leaf surfaces are wet, fungal spores being transported by wind or rain land on the surface and cling to it. They do not rupture the cell walls but grow in the space between the plant plasma membrane and the plant cell wall. As the spores reproduce, they release toxins and enzymes that cause necrotic spots (i.e., dead tissue) on the leaves, allowing the fungi to consume the products released when the cells degrade.
Solutions
Solutions
In minor cases of brown spot, there isn’t any need to treat the disease. However, if much of the foliage is affected and defoliation occurs, the plant will benefit from getting rid of the infection. It is recommended to start by applying organic treatment options, working up to the more potent synthetic, chemical fungicides if necessary.
Organic options won’t kill the fungus, but will prevent it from spreading.
  1. Dissolve ½ teaspoon of baking soda and one teaspoon of liquid soap in a gallon of water. Using a spray bottle, spray on tops and bottoms of leaves until the mixture drips off. Repeat every two weeks until existing spots stop enlarging and new spots no longer appear.
  2. Spray a copper-based fungicidal soap on the leaves, coating the top and bottom leaf surfaces. Reapply as directed on the product label. Copper penetrates the leaf surface and prevents germination of spores so the fungus cannot spread.
  3. Apply an all-purpose fungicide to the entire plant, following the label instructions carefully.
Prevention
Prevention
Like many other diseases, it is easier to prevent brown spot than cure it, and this is done through cultural practices.
  • Clear fall leaves from the ground before winter to minimize places where fungi and bacteria can overwinter.
  • Maintain good air movement between plants through proper plant spacing.
  • Increase air circulation through the center of plants through pruning.
  • Thoroughly clean all pruning tools after working with diseased plants.
  • Never dispose of disease plant material in a compost pile.
  • Avoid overhead watering to keep moisture off of the foliage.
  • Keep plants healthy by providing adequate sunlight, water, and fertilizer.
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Aged yellow and dry
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Aged yellow and dry
Natural aging can cause leaves to turn yellow and dry out.
Overview
Overview
Regardless of the type of plant or where it is grown, at some point, it will begin to aged yellow and dry. This is a natural, unavoidable process that happens when the plant has completed all of the steps in its life.
Annual plants go through this process at the end of a single growing season. Perennial plants live for multiple years, if not tens or hundreds of years, but will still ultimately exhibit these symptoms.
Symptom Analysis
Symptom Analysis
When plants have progressed through their natural developmental stages and are nearing the end of their lifecycle, they begin showing signs of decline. Leaves will start to yellow and droop, and over time they turn papery brown and dry.
Once completely dry, the leaves begin to fall from the plant until the entire plant has dried out.
Disease Cause
Disease Cause
At the end of its life, genetic coding within the plant increases the production of ethylene, a phytohormone that controls senescence or natural aging and death. Cell division stops, and the plant begins catabolizing resources to use in other parts of the plant.
As this happens, the tissues begin yellow and drying until the entire plant is desiccated and perishes.
Solutions
Solutions
If the yellowing and drying of leaves and flowers is a natural progression due to age, nothing can be done to slow or stop the process. Once hormones within the plant begin the process of senescence, it’s irreversible.
Prevention
Prevention
Unfortunately, there is no way to prevent plants from dying of “old age.” To help prolong their life, and put off symptoms of aged yellow and dry for as long as possible, take care of them by giving them enough water, fertilizing them appropriately, and making sure they get enough sunlight.
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Sap-sucking insects
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Sap-sucking insects
Sap-sucking insects can create dense clusters of small yellow or white spots on the leaves.
Symptom Analysis
Symptom Analysis
Your plant has developed tiny yellowish spots scattered across the leaves that look like mold or mildew. If these marks won't wipe off, they are likely caused by sap-sucking insects like aphids, squash bugs, scale bugs, leafhoppers, whiteflies, mites, mealybugs, and more.
Each of these pests uses mouthparts to pierce leaf tissues and suck the sap. uses mouthparts to pierce leaf tissues and suck the sap. Signs of damage are difficult to spot at first, but a large infestation can quickly compromise the whole plant. You're most likely to see sap-sucking insects during the hottest months because plants make easier targets when already weakened from heat or drought.
Though sap-sucking insects are unlikely to kill your plant on their own, they can severely weaken it and make it more susceptible to disease. They may also spread viruses from one plant to another as they feed.
Solutions
Solutions
Sap-sucking insects can be hard to spot, as they are often small and attach to the undersides of plant leaves. If you see signs of an infestation, follow these steps to eradicate it.
  1. Hand-pick bugs and remove eggs: Inspect your plants for insects and drop any you find in a container of soapy water. Look carefully at the undersides of plant leaves and squish any egg clusters you find.
  2. Use Insecticide: Targeted spraying can take out sap-sucking insects. Small infestations can be controlled with insecticidal soap, though larger outbreaks might require a stronger spray.
  3. Introduce natural predators: Many insects, including ladybugs and praying mantises, love to feast on sap-suckers. You can purchase them at garden stores and release them near infected plants, or encourage wild ones by creating habitat space.
Prevention
Prevention
Healthy plants are less likely to suffer from sap-sucker attacks. Keep them fortified with fertilizer and the right amounts of water and sunlight. Plants that receive excess nitrogen are also more susceptible to attack, so don’t overfertilize. You should also remove weeds and tall grasses surrounding your outdoor plants so as not to create habitat space for the pests.
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Leaf miners
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Leaf miners
Leaf miners scar the leaves with curved white streaks or rounded white spots with brown centers.
Symptom Analysis
Symptom Analysis
The leaves on your plants are showing clear/white trails, which appear like parts have been hollowed out. These trails are narrow at first and become wide patches over time. In some cases, leaves will be completely hollow and dry on the plant. As the name suggests, leaf miners are responsible.
Leaf miners are most common in the early spring when they begin to hatch and reproduce. They are tiny 1/16th inch larvae that resemble small grains of rice. The larvae are found inside leaves. The adult stage, a fly, lays eggs in between the layers of a leaf. When the eggs hatch, the larvae eat the tender nutritious inner leaves.
Solutions
Solutions
Leaf miners, although relatively harmless at first, can quickly multiply and devastate your plants in the coming weeks.
For severe cases:
  1. Spray an organic insecticide. For an organic solution, spray a diluted mixture of azadirachtin, a compound derived from neem seeds, above and below leaves.
  2. Spray a synthetic insecticide. Spray a product that contains spinosad, such as Entrust, making sure to cover all sides of the leaves.
  3. Introduce beneficial insects. Introduce beneficial insects that eat leaf miners, such as parasitic wasps or Syrphid flies.
For less severe cases:
  1. Prune infected tissue. Remove and dispose of leaves that have any sign of leaf miner damage.
Prevention
Prevention
Although leaf miners are easy to control, preventing them is ideal. Our recommendations are:
  1. Physically exclude adults. Cover plants with floating row covers as soon as you put them in the ground.
  2. Remove weeds and debris. Keep your garden weeded to lower the number of plants leaf miners can feed and breed on.
  3. Avoid introducing infected plants. Carefully inspect new plants for leaf miners before adding them to your garden or home.
  4. Avoid broad-spectrum pesticides. Leaf miners can usually be controlled by natural predatory insects. Do not apply broad-spectrum insecticides that could harm these beneficial insects.
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distribution

Distribution of Adzuki bean

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Habitat of Adzuki bean

Cultivated land

Distribution Map of Adzuki bean

Adzuki bean is a plant natively found in East Asia and regions of Northeast Asia. It has also been introduced and cultivated in parts of South Asia, Southeast Asia, East Africa, Central America, and the Caribbean. Adzuki bean has adapted well outside its native range, establishing a presence in a variety of climates and being cultivated in a number of regions where it was introduced.
distribution map
Native
Cultivated
Invasive
Potentially invasive
Exotic
No species reported
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More Info on Adzuki Bean Growth and Care

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Basic Care Guide
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Plants Related to Adzuki bean

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Lighting
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Indoor
Indoor
Outdoor
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Requirements
Full sun
Ideal
Above 6 hours sunlight
Partial sun
Tolerance
About 3-6 hours sunlight
Watch how sunlight gracefully moves through your garden, and choose spots that provide the perfect balance of light and shade for your plants, ensuring their happiness.
Essentials
Adzuki bean thrives under intensively exposed light settings, which significantly propels its vigorous growth and health. Although it can endure light shade, it could risk suboptimal growth. The plant originates from habitats receiving abundant light. Insufficient or excessive light exposure often hampers the plant's optimal state.
Preferred
Tolerable
Unsuitable
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Artificial lighting
Indoor plants require adequate lighting for optimal growth. When natural sunlight is insufficient, particularly in winter or in less sunny spaces, artificial lights offer a vital solution, promoting faster, healthier growth.
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Indoor plants require adequate lighting for optimal growth. When natural sunlight is insufficient, particularly in winter or in less sunny spaces, artificial lights offer a vital solution, promoting faster, healthier growth.
1. Choose the right type of artificial light: LED lights are a popular choice for indoor plant lighting because they can be customized to provide the specific wavelengths of light that your plants need.
Full sun plants need 30-50W/sq ft of artificial light, partial sun plants need 20-30W/sq ft, and full shade plants need 10-20W/sq ft.
2. Determine the appropriate distance: Place the light source 12-36 inches above the plant to mimic natural sunlight.
3. Determine the duration: Mimic the length of natural daylight hours for your plant species. most plants need 8-12 hours of light per day.
Important Symptoms
Symptoms of Insufficient Light in %s
Adzuki bean thrives in full sunlight and is commonly cultivated outdoors. When grown indoors with limited light, it may exhibit subtle symptoms of light deficiency that can easily go unnoticed.
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Small leaves
New leaves may grow smaller in size compared to the previous ones once they have matured.
Leggy or sparse growth
The spaces between leaves or stems of your Adzuki bean may become longer, resulting in a thin and stretched-out appearance. This can make the plant look sparse and weak, and it may easily break or lean due to its own weight.
Faster leaf drop
When plants are exposed to low light conditions, they tend to shed older leaves early to conserve resources. Within a limited time, these resources can be utilized to grow new leaves until the plant's energy reserves are depleted.
Slower or no new growth
Adzuki bean enters a survival mode when light conditions are poor, which leads to a halt in leaf production. As a result, the plant's growth becomes delayed or stops altogether.
Lighter-colored new leaves
Insufficient sunlight can cause leaves to develop irregular color patterns or appear pale. This indicates a lack of chlorophyll and essential nutrients.
Solutions
1. To ensure optimal growth, gradually move plants to a sunnier location each week, until they receive at least 6 hours of direct sunlight daily. Use a south-facing window and keep curtains open during the day for maximum sunlight exposure and nutrient accumulation.2. To provide additional light for your plant, consider using artificial light if it's large or not easily movable. Keep a desk or ceiling lamp on for at least 8 hours daily, or invest in professional plant grow lights for ample light.
Symptoms of Excessive light in %s
Adzuki bean thrives in full sun exposure and can tolerate intense sunlight. With their remarkable resilience, symptoms of sunburn may not be easily visible, as they rarely suffer from it.
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Chlorosis
Chlorosis is a condition where the plant's leaves lose their green color and turn yellow. This is due to the breakdown of chlorophyll from excessive sunlight, which negatively affects the plant's ability to photosynthesize.
Sunscald
Sunscald occurs when the plant's leaves or stems are damaged by intense sunlight exposure. It appears as pale, bleached, or necrotic areas on the plant tissue and can reduce the plant's overall health.
Leaf Curling
Leaf curling is a symptom where leaves curl or twist under extreme sunlight conditions. This is a defense mechanism used by the plant to reduce its surface area exposed to sunlight, minimizing water loss and damage.
Wilting
Wilting occurs when a plant loses turgor pressure and its leaves and stems begin to droop. Overexposure to sunlight can cause wilting by increasing the plant's water loss through transpiration, making it difficult for the plant to maintain adequate hydration.
Leaf Scorching
Leaf scorching is a symptom characterized by the appearance of brown, dry, and crispy edges or patches on leaves due to excessive sunlight. This can lead to a reduction in photosynthetic capacity and overall plant health.
Solutions
1. Move your plant to the optimal position where it can receive abundant sunlight but also have some shade. An east-facing window is an ideal choice as the morning sunlight is gentler. This way, your plant can enjoy ample sunlight while reducing the risk of sunburn.2. It is recommended to trim off any completely dehydrated or withered parts of the plant.
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Temperature
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Indoor
Indoor
Outdoor
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Requirements
Ideal
Tolerable
Unsuitable
Just like people, each plant has its own preferences. Learn about your plants' temperature needs and create a comforting environment for them to flourish. As you care for your plants, your bond with them will deepen. Trust your intuition as you learn about their temperature needs, celebrating the journey you share. Lovingly monitor the temperature around your plants and adjust their environment as needed. A thermometer can be your ally in this heartfelt endeavor. Be patient and gentle with yourself as you explore your plants' temperature needs. Cherish your successes, learn from challenges, and nurture your garden with love, creating a haven that reflects the warmth of your care.
Essentials
Adzuki bean originates from environments with temperatures ranging from 68 to 100.4°F (20 to 38℃). It thrives in these conditions, making it a warm-season crop. Seasonal temperature adjustments may be necessary if local conditions diverge significantly.
Regional wintering strategies
Adzuki bean prefers relatively warm temperatures, so maintaining temperatures above {Suitable_growth_temperature_min} during winter cultivation is beneficial for plant growth. The minimum temperature should be kept above freezing point to prevent the plant from freezing damage. When the outdoor temperature approaches -5°C (25°F) during winter, it is advisable to bring Adzuki bean indoors or provide protection by setting up a temporary greenhouse or using materials such as plastic film or fabric to wrap the plant.
Important Symptoms
Symptoms of Low Temperature in Adzuki bean
Adzuki bean has moderate tolerance to low temperatures and thrives best when the temperature is between {Suitable_growth_temperature_min} and {Suitable_growth_temperature_max}. During winter, it should be kept above {Tolerable_growing_temperature_min}. When the temperature falls below {Limit_growth_temperature}, the leaves may darken in color. In severe cases, water-soaked necrosis, wilting, and drooping may occur, and the color of the leaves gradually turns brown.
Solutions
Trim away the frost-damaged parts. Immediately move indoors to a warm environment or set up a makeshift greenhouse for cold protection. When placing the plant indoors, choose a location near a south-facing window to ensure ample sunlight. If there is insufficient light, you can use supplemental lighting.
Symptoms of High Temperature in Adzuki bean
During summer, Adzuki bean should be kept below {Suitable_growth_temperature_max}. When the temperature exceeds {Tolerable_growing_temperature_max}, the plant's growth slows down, the color of its leaves becomes lighter, and it becomes more susceptible to sunburn.
Solutions
Trim away the sunburned and dried-up parts. Move the plant to a location that provides shade from the afternoon sun. Water the plant in the morning and evening to keep the soil moist.
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