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Japanese maple 'Korean Gem'
Japanese maple 'Korean Gem'
Japanese maple 'Korean Gem'
Acer palmatum var. coreanum 'Korean Gem'
Also known as : Palmate maple 'Korean Gem'
Hardiness Zones
Hardiness Zones
3 to 10
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Care Guide for Japanese maple 'Korean Gem'

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Soil Care
Soil Care
Clay, Chalky, Slightly acidic
Details on Soil Care Soil Care
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Ideal Lighting
Partial sun, Partial sun
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Ideal Temperature
Ideal Temperature
3 to 10
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Japanese maple 'Korean Gem'
Sunlight
Sunlight
Partial sun
Hardiness Zones
Hardiness Zones
3 to 10
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Questions About Japanese maple 'Korean Gem'

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Watering Watering Watering
Pruning Pruning Pruning
Sunlight Sunlight Sunlight
Temperature Temperature Temperature
What's the best method to water my Japanese maple 'Korean Gem'?
You might want to put a garden hose at the plant base to ensure that you're promoting excellent root development. Avoid directly spraying the leaves, and know that the leaves will require more watering if they are outdoors and facing direct sunlight. You can also use bubblers that you can put on to each plant to moisten the roots. Also, use soaker hoses that can cover the entire garden or bed when adding or removing plants to push the roots deeply. Drain any excess water and wait for the soil to dry before watering. Water at ground level to prevent diseases. On a sunny day, you might want to spray the entire bush with water. Whether potted or in-ground, please remember Japanese maple 'Korean Gem' prefers deep watering over light sprinkling.
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What should I do if I water Japanese maple 'Korean Gem' too much/too little?
An overwatered Japanese maple 'Korean Gem' can start to have leaves that turn yellow, drop off and wilt. The plant can also look dull and unhealthy, with signs of mushy stems. When they are beginning to show these signs, it's best to adjust your schedule whenever possible. The wilting can also be a sign of under watering as well. You might see that the leaves begin to turn crispy and dry while the overwatered ones will have soft wilted leaves. Check the soil when it is dry and watering is not enough, give it a full watering in time. Enough water will make the Japanese maple 'Korean Gem' recover again, but the plant will still appear dry and yellow leaves after a few days due to the damaged root system. Once it return to normal, the leave yellowing will stop . Always check the moisture levels at the pot when you have the Japanese maple 'Korean Gem' indoors. Avoid overwatering indoors and see if there are signs of black spots. If these are present, let the soil dry in the pot by giving it a few days of rest from watering. Overwatering can lead to root rot being present in your plant. If this is the case, you might want to transfer them into a different pot, especially if you see discolored and slimy roots. Always prevent root rot as much as possible, and don't let the soil become too soggy. You should dig a little deeper when you plant your Japanese maple 'Korean Gem' outdoors. When you check with your fingers and notice that the soil is too dry, it could mean underwatering. Adequate watering is required to help the plant recover.
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How often should I water my Japanese maple 'Korean Gem'?
The Japanese maple 'Korean Gem' likes deep and infrequent watering. You would want to soak them in a gallon of water each time, especially when they are planted in pots. The water storage of flower pots is limited and the soil will dry out faster. Watering is required every 3 to 5 days when living in a cold region. Water it early in the morning when the soil is dry, outdoors or indoors. You can also determine if watering is needed by checking the soil inside. When the top 2-3 inches of soil is dry, it is time to give the plant a full watering. During hot days, you may need to check the moisture daily, as the heat can quickly dry out the soil in the pot. Irrigation of the soil is also required if you have a garden. When you live in a hot climate, you might want to water once a week. Only water when you notice that about 2 to 3 inches of soil become too dry outdoors or indoors. Consider the amount of rainwater on the plant and ensure not to add to it to prevent root rot.You may not need additional watering of the plants if there is a lot of rainfall.Japanese maple 'Korean Gem' generally grows during spring and fall. When they are outdoors, you need to add mulch about 3 to 4 inches deep to conserve more water. You need to water the plants more frequently in sandy soil because this type tends to drain faster. However, with the clay one, you need to water this less frequently where you could go for 2-3 days to dry the plant and not develop any root rot. You could mark the date on the calendar whenever you water and when you notice that the leaves are starting to droop. This can mean that you might be a day late.
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How much water do I need to give my Japanese maple 'Korean Gem'?
The Japanese maple 'Korean Gem' generally needs about a gallon of water each schedule,With the potted plants, you might want to water them deeply until you see that the water is dripping at the bottom of the pot. Then, wait for the soil to dry before watering them again. You can use a water calculator or a moisture meter to determine the amount you've given to your plant in a week. Provide plenty of water, especially in the flowering period, but let the moisture evaporate afterwards to prevent root rot. If Japanese maple 'Korean Gem' is planted outdoor with adequate rainfall, it may not need additional watering. When Japanese maple 'Korean Gem' is young or newly planted, make sure it gets 1-2 inches of rain per week. As Japanese maple 'Korean Gem' continues to grow, it can survive entirely on rainfall. Only when the weather is too hot, or when there is no rainfall at all for 2-3 weeks, then consider giving Japanese maple 'Korean Gem' a full watering during the cooler moment of the day to prevent the plant from suffering from high heat damage. Additional watering will be required during persistent dry spells.
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Should I adjust the watering frequency for my Japanese maple 'Korean Gem' according to different seasons or climates?
The Japanese maple 'Korean Gem' needs outdoors come from rain, with only persistent dry weather requiring watering. Throughout the spring and fall growing seasons, the soil needs to be kept moist but not soggy, and alternating dry and moist soil conditions will allow the Japanese maple 'Korean Gem' to grow well. Throughout the summer, hot weather can cause water to evaporate too quickly, and if there is a lack of rainfall, you will need to water more frequently and extra to keep it moist. Usually, the Japanese maple 'Korean Gem' will need less water during the winter. Since the Japanese maple 'Korean Gem' will drop their leaves and go dormant, you can put them into a well-draining but moisture-retentive soil mixture like the terracotta to help the water evaporate quicker. Once your Japanese maple 'Korean Gem' growing outdoors begins to leaf out and go dormant, you can skip watering altogether and in most cases Japanese maple 'Korean Gem' can rely on the fall and winter rains to survive the entire dormant period. After the spring, you can cultivate your Japanese maple 'Korean Gem' and encourage it to grow and bloom when the temperature becomes warmer.This plant is not generally a fan of ponding or drought when flowering. You must ensure that the drainage is good at all times, especially during the winter. When the plant is in a pot, the plant has limited root growth. Keep them well-watered, especially if they are planted in pots during summer. They don't like cold and wet roots, so provide adequate drainage, especially if they are still growing. It's always best to water your Japanese maple 'Korean Gem'’s diligently. Get the entire root system into a deep soak at least once or twice a week, depending on the weather. It's best to avoid shallow sprinkles that reach the leaves since they generally encourage the growth of fungi and don't reach deep into the roots. Don't allow the Japanese maple 'Korean Gem'’s to dry out completely in the fall or winter, even if they are already dormancy. Don't drown the plants because they generally don't like sitting in water for too long. They can die during winter if the soil does not drain well. Also, apply mulch whenever possible to reduce stress, conserve water, and encourage healthy blooms.
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What should I be careful with when I water my Japanese maple 'Korean Gem' in different seasons, climates, or during different growing periods?
If planting in the ground, Japanese maple 'Korean Gem' mostly relies on rain. However, if there is no rainfall for 2-3 weeks, you may need to give proper consideration to giving the plants a deep watering. If watering Japanese maple 'Korean Gem' in summer, you should try to do it in the morning. A large temperature difference between the water temperature and the root system can stress the roots. You need to avoid watering the bushes when it's too hot outside. Start mulching them during the spring when the ground is not too cold. The age of the plants matter. Lack of water is one of the most common reasons the newly planted ones fail to grow. After they are established, you need to ease off the watering schedule. Reduce watering them during the fall and winter, especially if they have a water-retaining material in the soil. The dry winds in winter can dry them out, and the newly planted ones can be at risk of drought during windy winter, summer, and fall. Windy seasons mean that there's more watering required. The ones planted in the pot tend to dry out faster, so they need more watering. Once you see that they bloom less, the leaves begin to dry up. Potted plants are relatively complex to water and fluctuate in frequency. Always be careful that the pot-planted plant don't sit in the water. Avoid putting them in containers with saucers, bowls, and trays. Too much watering in the fall can make the foliage look mottled or yellowish. It's always a good idea to prevent overwatering them regardless of the current climate or season that you might have. During the months when Japanese maple 'Korean Gem' begins to flower, you might want to increase the watering frequency but give it a rest once they are fully grown. Give them an adequate amount of water once every 3 to 5 days but don't give them regular schedules. Make sure the soil is dry by sticking your finger in the pot, or use a moisture meter if you're unsure if it's the right time. Too much root rot can cause them to die, so be careful not to overwater or underwater regardless of the climate or season you have in your area.
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Why is watering my Japanese maple 'Korean Gem' important?
Watering the Japanese maple 'Korean Gem' helps transport the needed nutrients from the soil to the rest of the plant. The moisture will keep this species healthy if you know how much water to give. The watering requirements will depend on the weather in your area and the plant's soil. The Japanese maple 'Korean Gem' thrives on moist soil, but they can't generally tolerate waterlogging. Ensure to provide enough mulch when planted on the ground and never fall into the trap of watering too little. They enjoy a full can of watering where the water should be moist at the base when they are planted in a pot to get the best blooms. If they are grown as foliage, you need to water them up to a depth of 10 to 20 inches so they will continue to grow. If it's raining, refrain from watering and let them get the nutrients they need from the rainwater.
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Key Facts About Japanese maple 'Korean Gem'

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Attributes of Japanese maple 'Korean Gem'

Lifespan
Perennial
Plant Type
Tree
Leaf Color
Red
Green
Dormancy
Winter dormancy
Leaf type
Deciduous
Ideal Temperature
0 - 35 ℃

Scientific Classification of Japanese maple 'Korean Gem'

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Common Pests & Diseases About Japanese maple 'Korean Gem'

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Common issues for Japanese maple 'Korean Gem' based on 10 million real cases
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Leaf yellowing
Leaf yellowing in Japanese maple 'Korean Gem' is a common issue that can significantly impact the plant's aesthetics and health. It often indicates nutrient deficiencies or diseases, leading to poor growth and vitality.
Scars
Scars Scars
Scars
Any light-colored markings that appear on stems but which do not enlarge or multiply are simply scars that have healed.
Solutions: Each source of scarring requires a different approach to help your plant recover. Protect the trunk and leaves from physical damage like scrapes. If pests or disease are the cause of scarring, isolate the plant from others to avoid further spread. Some pests can be removed with organic remedies such as a soft cloth and soapy water solution or diluted isopropyl alcohol spray. Stop sunburn by moving your plant away from direct sunlight and making sure it has the water it needs. Frequent leaf or bud loss may be due to insufficient light or nutrients.
Fruit withering
Fruit withering Fruit withering
Fruit withering
Fungal infection or normal ripening can cause the fruit to dry out.
Solutions: There are a number of appropriate solutions to control fruit withering: Remove any fruit as soon as it shows any signs of infection. Do not compost. Use a fungicide prior to leaf bud and then as per manufacturers instructions throughout the season.
Black spot
Black spot Black spot
Black spot
Infection by the black spot pathogen causes black spots or patches to appear on leaves.
Solutions: Some steps to take to address black spot include: Prune away any infected leaves, cleaning the pruners between plants with a 10% bleach solution so that the fungus does not spread to healthy leaves. Don't compost pruned plant parts as the spores can linger in the soil for a long period of time - instead, dispose of them in the trash. Use an approved fungicide such as Trifloxystrobin, Chlorothalonil, Maneb, or Myclobutanil. Use a spreader in the fungicide spray to ensure better coverage.
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Leaf yellowing
Overview
Symptom
Causes
Treatment
Prevention
Active Period
What is Leaf yellowing Disease on Japanese maple 'Korean Gem'?
What is Leaf yellowing Disease on Japanese maple 'Korean Gem'?
Leaf yellowing in Japanese maple 'Korean Gem' is a common issue that can significantly impact the plant's aesthetics and health. It often indicates nutrient deficiencies or diseases, leading to poor growth and vitality.
Symptom Analysis
Symptom Analysis
On Japanese maple 'Korean Gem', leaf yellowing typically starts at the edges or between veins and gradually spreads, encompassing the whole leaf. Affected leaves might also drop prematurely.
What Causes Leaf yellowing Disease on Japanese maple 'Korean Gem'?
What Causes Leaf yellowing Disease on Japanese maple 'Korean Gem'?
1
Nutrient deficiency
Lack of essential nutrients like nitrogen, magnesium, or iron can cause leaves to yellow.
2
Watering issues
Both overwatering and underwatering can lead to yellowing leaves.
3
Pathogens
Fungal or viral infections can disrupt normal leaf coloration.
4
Environmental stress
Excessive sunlight or poor soil conditions can trigger yellowing.
How to Treat Leaf yellowing Disease on Japanese maple 'Korean Gem'?
How to Treat Leaf yellowing Disease on Japanese maple 'Korean Gem'?
1
Non pesticide
Adjust watering: Ensure proper watering schedules based on the plant's needs to avoid both overwatering and underwatering.

Nutrient management: Administer soil amendments or foliar feeds to correct nutrient deficiencies.

Shade provision: Provide partial shade to alleviate stress from excessive sunlight.
2
Pesticide
Fungicides: Use fungicides to manage fungal infections, apply as per the manufacturer's directions.

Antiviral agents: Employ antiviral treatments if a viral cause is confirmed, following safety and application guidelines.
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Scars
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Scars
Any light-colored markings that appear on stems but which do not enlarge or multiply are simply scars that have healed.
Symptom Analysis
Symptom Analysis
Scars form when the plant repairs wounds. They can be the result of people or pets passing by and scraping the plant. Once the underlying issue is resolved, the plant will heal but a scar may remain.
Pests and pathogens can also cause scarring. Insects may attack the plant for a meal, resulting in extensive scarring when a few invaders turn into an infestation. Diseases such as fungus and bacteria can weaken the plant, causing brown spots, mushy areas, or blisters that lead to scars.
Scars occur on stems when a leaf or bud has been lost and the plant has healed. The harder tissue is like a scab that protects a wound.
On other occasions, scars can signal problems from environmental conditions, such as overexposure to sunlight or heat. It might surprise you to know that plants can suffer from sunburn, even desert dwellers like cactus!
Solutions
Solutions
Each source of scarring requires a different approach to help your plant recover.
  1. Protect the trunk and leaves from physical damage like scrapes.
  2. If pests or disease are the cause of scarring, isolate the plant from others to avoid further spread. Some pests can be removed with organic remedies such as a soft cloth and soapy water solution or diluted isopropyl alcohol spray.
  3. Stop sunburn by moving your plant away from direct sunlight and making sure it has the water it needs.
  4. Frequent leaf or bud loss may be due to insufficient light or nutrients.
Prevention
Prevention
Preventing some sources of scarring is easier than others, but all start with careful attention to your plants once you decide to bring them home.
  1. Review specific guidelines for your plant, including soil drainage, watering, and fertilizer requirements.
  2. Inspect plants before planting and use sterile pots and fresh potting soil or media to limit transfer of fungi or bacteria.
  3. Once established, check your plants regularly for signs of scarring or the presence of pests, as it is better to catch problems as early as possible.
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Fruit withering
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Fruit withering
Fungal infection or normal ripening can cause the fruit to dry out.
Overview
Overview
Fruit withering is common on many tree fruits, including apples, pears, peaches, cherries, and plums, as well as fruiting shrubs. It is caused by a fungal pathogen and will result in wrinkled and desiccated fruit.
Symptom Analysis
Symptom Analysis
Here are the most common symptoms in the order that they are likely to occur.
  1. Both leaves and blossom on the tips of branches will go brown and wither.
  2. Gray powdery patches will appear on infected leaves and flowers, and this will be most apparent after rain.
  3. Any fruit that does appear will turn wrinkled and fail to develop.
  4. Branch tips begin to die, progressing back to larger branches, causing general deterioration of the tree or plant.
Disease Cause
Disease Cause
The withering is caused by one of two fungal pathogens, one called Monilina laxa and the other called M. fructigen. The spores overwinter on infected plant material and are then spread the following spring by wind, rain, or animal vectors. The problem will start to become noticeable in mid-spring, but will increase in severity as summer progresses and the fungus grows. If not addressed, the disease will intensify and spread to other plants in the vicinity.
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Black spot
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Black spot
Infection by the black spot pathogen causes black spots or patches to appear on leaves.
Overview
Overview
Black spot is a fungus that largely attacks leaves on a variety of ornamental plants, leaving them covered in dark spots ringed with yellow, and eventually killing them. The fungus is often simply unsightly, but if it infects the whole plant it can interfere with photosynthesis by killing too many leaves. Because of this, it is important to be aware of the best methods for preventing and treating this diseases should it occur in the garden.
Symptom Analysis
Symptom Analysis
Here are a few of the most common symptoms of black spot:
  • The plant has developed small black spots along the leaves.
  • These spots be small, circular, and clustered together, or they may have a splotchy appearance and take up large portions of the leaves.
  • The fungus may also affect plant canes, where lesions start purple and then turn black.
  • The plant may suffer premature leaf drop.
Though most forms of black spot fungus pose little risk to a plant's overall health, many gardeners find them unsightly. Severe cases can also weaken a plant, so it becomes more susceptible to other pathogens and diseases.
Disease Cause
Disease Cause
Black spot is spread by various types of fungi, which differ slightly depending on whether they are in their sexual or asexual stages.
The fungal spores linger over the winter in fallen leaves and lesions on canes. In the spring, the spores are splashed up onto the leaves, causing infection within seven hours of moisture and when temperatures range between 24 to 29 ℃ with a high relative humidity.
In just two weeks, thousands of additional spores are produced, making it easy for the disease to infect nearby healthy plants as well.
There are several factors that could make a plant more likely to suffer a black spot infection. Here are some of the most common:
  • Exposure to infected plants or mulch (the fungus overwinters on dead leaves)
  • Weakening from physical damage, pest infestation or other infections.
  • Increased periods of wet, humid, warm weather – or exposure to overhead watering
  • Plants growing too close together
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More Info on Japanese Maple 'korean Gem' Growth and Care

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Basic Care Guide
Common Pests & Diseases
Transplant
15-20 feet (4.5-6 meters)
Japanese maple 'Korean Gem' thrives when transplanted during the dormant periods of early spring or mid-winter, as this minimizes stress. Preferably, choose a well-drained location with partial shade to provide the best environment for successful transplanting.
Transplant Techniques
Pruning
Early spring, Late winter
Renowned for its vibrant foliage, japanese maple 'Korean Gem' requires careful pruning to maintain its aesthetic form and health. Optimal pruning should occur in late winter or early spring, when dormant, to enhance its natural shape, control its size, and prevent diseases. Thinning out crowded branches and removing any dead or damaged wood are crucial. These practices ensure light and air circulation within the canopy, promoting a robust structure and vibrant leaf color, thereby augmenting japanese maple 'Korean Gem''s ornamental value.
Pruning techniques
Propagation
Autumn,Winter
Japanese maple 'Korean Gem' thrives when propagated through cutting methods, ensuring genetic consistency. Prepare semi-hardwood cuttings from healthy branches during active growth phases. Dip the end of each cutting in rooting hormone to promote root development. Plant in a well-draining substrate, maintaining moisture without waterlogging, and cover with a plastic dome or bag to create a humid environment, facilitating root formation. Gradually acclimate the young plants to outside conditions before planting them in their permanent locations.
Propagation Techniques
Leaf yellowing
Leaf yellowing in Japanese maple 'Korean Gem' is a common issue that can significantly impact the plant's aesthetics and health. It often indicates nutrient deficiencies or diseases, leading to poor growth and vitality.
Read More
Dark blotch
Dark blotch disease notably affects Japanese maple 'Korean Gem', manifesting as discolorations and potential leaf drop, impacting the aesthetics and health of the plant.
Read More
Yellow edges
Yellow edges is a condition affecting the Japanese maple 'Korean Gem', characterized by yellowing margins on leaves which can deteriorate the plant's aesthetic and health if untreated.
Read More
Leaf tip withering
Leaf tip withering in Japanese maple 'Korean Gem' is a disease manifesting as progressive drying and dying of the leaf tips, and potentially impacts plant vitality and aesthetics, reducing its ornamental value.
Read More
Dark spots
Dark spots on Japanese maple 'Korean Gem' typically manifest as circular brown or black patches on leaves, leading to premature leaf drop and reduced aesthetic value. This condition affects the plant's photosynthesis and overall health.
Read More
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Japanese maple 'Korean Gem'
Japanese maple 'Korean Gem'
Japanese maple 'Korean Gem'
Acer palmatum var. coreanum 'Korean Gem'
Also known as: Palmate maple 'Korean Gem'
Hardiness Zones
Hardiness Zones
3 to 10
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Care Guide for Japanese maple 'Korean Gem'

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Questions About Japanese maple 'Korean Gem'

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Watering Watering Watering
Pruning Pruning Pruning
Sunlight Sunlight Sunlight
Temperature Temperature Temperature
What's the best method to water my Japanese maple 'Korean Gem'?
more
What should I do if I water Japanese maple 'Korean Gem' too much/too little?
more
How often should I water my Japanese maple 'Korean Gem'?
more
How much water do I need to give my Japanese maple 'Korean Gem'?
more
Should I adjust the watering frequency for my Japanese maple 'Korean Gem' according to different seasons or climates?
more
What should I be careful with when I water my Japanese maple 'Korean Gem' in different seasons, climates, or during different growing periods?
more
Why is watering my Japanese maple 'Korean Gem' important?
more
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Key Facts About Japanese maple 'Korean Gem'

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Feedback
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Attributes of Japanese maple 'Korean Gem'

Lifespan
Perennial
Plant Type
Tree
Leaf Color
Red
Green
Dormancy
Winter dormancy
Leaf type
Deciduous
Ideal Temperature
0 - 35 ℃
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Scientific Classification of Japanese maple 'Korean Gem'

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Common Pests & Diseases About Japanese maple 'Korean Gem'

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Common issues for Japanese maple 'Korean Gem' based on 10 million real cases
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Leaf yellowing
Leaf yellowing in Japanese maple 'Korean Gem' is a common issue that can significantly impact the plant's aesthetics and health. It often indicates nutrient deficiencies or diseases, leading to poor growth and vitality.
Learn More About the Leaf yellowing more
Scars
Scars Scars Scars
Any light-colored markings that appear on stems but which do not enlarge or multiply are simply scars that have healed.
Solutions: Each source of scarring requires a different approach to help your plant recover. Protect the trunk and leaves from physical damage like scrapes. If pests or disease are the cause of scarring, isolate the plant from others to avoid further spread. Some pests can be removed with organic remedies such as a soft cloth and soapy water solution or diluted isopropyl alcohol spray. Stop sunburn by moving your plant away from direct sunlight and making sure it has the water it needs. Frequent leaf or bud loss may be due to insufficient light or nutrients.
Learn More About the Scars more
Fruit withering
Fruit withering Fruit withering Fruit withering
Fungal infection or normal ripening can cause the fruit to dry out.
Solutions: There are a number of appropriate solutions to control fruit withering: Remove any fruit as soon as it shows any signs of infection. Do not compost. Use a fungicide prior to leaf bud and then as per manufacturers instructions throughout the season.
Learn More About the Fruit withering more
Black spot
Black spot Black spot Black spot
Infection by the black spot pathogen causes black spots or patches to appear on leaves.
Solutions: Some steps to take to address black spot include: Prune away any infected leaves, cleaning the pruners between plants with a 10% bleach solution so that the fungus does not spread to healthy leaves. Don't compost pruned plant parts as the spores can linger in the soil for a long period of time - instead, dispose of them in the trash. Use an approved fungicide such as Trifloxystrobin, Chlorothalonil, Maneb, or Myclobutanil. Use a spreader in the fungicide spray to ensure better coverage.
Learn More About the Black spot more
close
plant poor
Leaf yellowing
Overview
Symptom
Causes
Treatment
Prevention
Active Period
What is Leaf yellowing Disease on Japanese maple 'Korean Gem'?
What is Leaf yellowing Disease on Japanese maple 'Korean Gem'?
Leaf yellowing in Japanese maple 'Korean Gem' is a common issue that can significantly impact the plant's aesthetics and health. It often indicates nutrient deficiencies or diseases, leading to poor growth and vitality.
Symptom Analysis
Symptom Analysis
On Japanese maple 'Korean Gem', leaf yellowing typically starts at the edges or between veins and gradually spreads, encompassing the whole leaf. Affected leaves might also drop prematurely.
What Causes Leaf yellowing Disease on Japanese maple 'Korean Gem'?
What Causes Leaf yellowing Disease on Japanese maple 'Korean Gem'?
1
Nutrient deficiency
Lack of essential nutrients like nitrogen, magnesium, or iron can cause leaves to yellow.
2
Watering issues
Both overwatering and underwatering can lead to yellowing leaves.
3
Pathogens
Fungal or viral infections can disrupt normal leaf coloration.
4
Environmental stress
Excessive sunlight or poor soil conditions can trigger yellowing.
How to Treat Leaf yellowing Disease on Japanese maple 'Korean Gem'?
How to Treat Leaf yellowing Disease on Japanese maple 'Korean Gem'?
1
Non pesticide
Adjust watering: Ensure proper watering schedules based on the plant's needs to avoid both overwatering and underwatering.

Nutrient management: Administer soil amendments or foliar feeds to correct nutrient deficiencies.

Shade provision: Provide partial shade to alleviate stress from excessive sunlight.
2
Pesticide
Fungicides: Use fungicides to manage fungal infections, apply as per the manufacturer's directions.

Antiviral agents: Employ antiviral treatments if a viral cause is confirmed, following safety and application guidelines.
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Scars
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Scars
Any light-colored markings that appear on stems but which do not enlarge or multiply are simply scars that have healed.
Symptom Analysis
Symptom Analysis
Scars form when the plant repairs wounds. They can be the result of people or pets passing by and scraping the plant. Once the underlying issue is resolved, the plant will heal but a scar may remain.
Pests and pathogens can also cause scarring. Insects may attack the plant for a meal, resulting in extensive scarring when a few invaders turn into an infestation. Diseases such as fungus and bacteria can weaken the plant, causing brown spots, mushy areas, or blisters that lead to scars.
Scars occur on stems when a leaf or bud has been lost and the plant has healed. The harder tissue is like a scab that protects a wound.
On other occasions, scars can signal problems from environmental conditions, such as overexposure to sunlight or heat. It might surprise you to know that plants can suffer from sunburn, even desert dwellers like cactus!
Solutions
Solutions
Each source of scarring requires a different approach to help your plant recover.
  1. Protect the trunk and leaves from physical damage like scrapes.
  2. If pests or disease are the cause of scarring, isolate the plant from others to avoid further spread. Some pests can be removed with organic remedies such as a soft cloth and soapy water solution or diluted isopropyl alcohol spray.
  3. Stop sunburn by moving your plant away from direct sunlight and making sure it has the water it needs.
  4. Frequent leaf or bud loss may be due to insufficient light or nutrients.
Prevention
Prevention
Preventing some sources of scarring is easier than others, but all start with careful attention to your plants once you decide to bring them home.
  1. Review specific guidelines for your plant, including soil drainage, watering, and fertilizer requirements.
  2. Inspect plants before planting and use sterile pots and fresh potting soil or media to limit transfer of fungi or bacteria.
  3. Once established, check your plants regularly for signs of scarring or the presence of pests, as it is better to catch problems as early as possible.
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Fruit withering
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Fruit withering
Fungal infection or normal ripening can cause the fruit to dry out.
Overview
Overview
Fruit withering is common on many tree fruits, including apples, pears, peaches, cherries, and plums, as well as fruiting shrubs. It is caused by a fungal pathogen and will result in wrinkled and desiccated fruit.
Symptom Analysis
Symptom Analysis
Here are the most common symptoms in the order that they are likely to occur.
  1. Both leaves and blossom on the tips of branches will go brown and wither.
  2. Gray powdery patches will appear on infected leaves and flowers, and this will be most apparent after rain.
  3. Any fruit that does appear will turn wrinkled and fail to develop.
  4. Branch tips begin to die, progressing back to larger branches, causing general deterioration of the tree or plant.
Disease Cause
Disease Cause
The withering is caused by one of two fungal pathogens, one called Monilina laxa and the other called M. fructigen. The spores overwinter on infected plant material and are then spread the following spring by wind, rain, or animal vectors. The problem will start to become noticeable in mid-spring, but will increase in severity as summer progresses and the fungus grows. If not addressed, the disease will intensify and spread to other plants in the vicinity.
Solutions
Solutions
There are a number of appropriate solutions to control fruit withering:
  1. Remove any fruit as soon as it shows any signs of infection. Do not compost.
  2. Use a fungicide prior to leaf bud and then as per manufacturers instructions throughout the season.
Prevention
Prevention
Preventative measures include:
  1. Ensuring adequate spacing between plants or trees.
  2. Staking plants that are prone to tumbling to prevent moisture or humidity build up.
  3. Prune correctly so that there is adequate air movement and remove any dead or diseased branches that may carry spores.
  4. Practice good plant hygiene by removing fallen material and destroying it as soon as possible.
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Black spot
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Black spot
Infection by the black spot pathogen causes black spots or patches to appear on leaves.
Overview
Overview
Black spot is a fungus that largely attacks leaves on a variety of ornamental plants, leaving them covered in dark spots ringed with yellow, and eventually killing them. The fungus is often simply unsightly, but if it infects the whole plant it can interfere with photosynthesis by killing too many leaves. Because of this, it is important to be aware of the best methods for preventing and treating this diseases should it occur in the garden.
Symptom Analysis
Symptom Analysis
Here are a few of the most common symptoms of black spot:
  • The plant has developed small black spots along the leaves.
  • These spots be small, circular, and clustered together, or they may have a splotchy appearance and take up large portions of the leaves.
  • The fungus may also affect plant canes, where lesions start purple and then turn black.
  • The plant may suffer premature leaf drop.
Though most forms of black spot fungus pose little risk to a plant's overall health, many gardeners find them unsightly. Severe cases can also weaken a plant, so it becomes more susceptible to other pathogens and diseases.
Disease Cause
Disease Cause
Black spot is spread by various types of fungi, which differ slightly depending on whether they are in their sexual or asexual stages.
The fungal spores linger over the winter in fallen leaves and lesions on canes. In the spring, the spores are splashed up onto the leaves, causing infection within seven hours of moisture and when temperatures range between 24 to 29 ℃ with a high relative humidity.
In just two weeks, thousands of additional spores are produced, making it easy for the disease to infect nearby healthy plants as well.
There are several factors that could make a plant more likely to suffer a black spot infection. Here are some of the most common:
  • Exposure to infected plants or mulch (the fungus overwinters on dead leaves)
  • Weakening from physical damage, pest infestation or other infections.
  • Increased periods of wet, humid, warm weather – or exposure to overhead watering
  • Plants growing too close together
Solutions
Solutions
Some steps to take to address black spot include:
  • Prune away any infected leaves, cleaning the pruners between plants with a 10% bleach solution so that the fungus does not spread to healthy leaves.
  • Don't compost pruned plant parts as the spores can linger in the soil for a long period of time - instead, dispose of them in the trash.
  • Use an approved fungicide such as Trifloxystrobin, Chlorothalonil, Maneb, or Myclobutanil.
  • Use a spreader in the fungicide spray to ensure better coverage.
Prevention
Prevention
Here are a few tips to prevent black spot outbreaks.
  • Purchase resistant varieties: Invest in fungus-resistant plant varieties to reduce the chances for black spot diseases.
  • Remove infected plant debris: Fungi can overwinter in contaminated plant debris, so remove all fallen leaves from infected plants as soon as possible.
  • Rake and discard fallen leaves in the fall.
  • Prune regularly.
  • Water carefully: Fungal diseases spread when plants stay in moist conditions and when water droplets splash contaminated soil on plant leaves. Control these factors by only watering infected plants when the top few inches of soil are dry, and by watering at soil level to reduce splashback. Adding a layer of mulch to the soil will also reduce splashing.
  • Grow plants in an open, sunny locations so the foliage dries quickly.
  • Follow spacing guidelines when planting and avoid natural windbreaks for good air circulation.
  • Use chemical control: Regular doses of a fungicide, especially in the spring, can stop an outbreak before it begins.
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