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Care Guide
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Pests & Diseases
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Canna lilies 'Pretoria'
Canna lilies 'Pretoria'
Canna lilies 'Pretoria'
Canna 'Pretoria'
Hardiness Zones
Hardiness Zones
8 to 12
care guide

Care Guide for Canna lilies 'Pretoria'

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Watering Care
Watering Care
Details on Watering Care Watering Care
Soil Care
Soil Care
Loam, Sand, Acidic, Neutral, 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
8 to 12
Details on Temperature Ideal Temperature
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Canna lilies 'Pretoria'
Sunlight
Sunlight
Full sun
Hardiness Zones
Hardiness Zones
8 to 12
plant_info

Key Facts About Canna lilies 'Pretoria'

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Attributes of Canna lilies 'Pretoria'

Lifespan
Perennial
Plant Type
Herb
Plant Height
1.5 m
Spread
50 cm
Leaf Color
Yellow
Green
Flower Size
13 cm to 15 cm
Flower Color
Orange
Leaf type
Semi-evergreen
Ideal Temperature
15 - 38 ℃

Scientific Classification of Canna lilies 'Pretoria'

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pests

Common Pests & Diseases About Canna lilies 'Pretoria'

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Common issues for Canna lilies 'Pretoria' based on 10 million real cases
Leaf rot
Leaf rot disease in Canna lilies 'Pretoria' results from fungal pathogens, characterized by decaying and shriveling foliage that stifles plant growth. Pertinent control and preventive mechanisms can minimize its spread and adverse implications.
Flower withering
Flower withering Flower withering
Flower withering
Flowers may dry out due to a sudden change in environment or because the plant has completed its normal flowering period.
Solutions: If flower withering is a natural progression due to age, there is nothing that can be done to slow or stop the process. Once hormones within the plant begin the process of senescence, it’s irreversible. For lack of water, immediately water the plant using room temperature rainwater, bottled spring water, or filtered tap water. Water container plants until excess water drains out the bottom; water in-ground plants until the soil is soaked but there isn’t standing water on the surface. In the event of nutritional deficiencies, the best solution is to use a granular or water-soluble liquid fertilizer, and apply it to the soil at about half the recommended dosage. Keep it off the leaves and make sure granular products are watered into the soil well. If the plant is infected with a bacterial or fungal pathogen, there is no course of treatment that cures the diseased plants. The best solution is to remove the infected plants and dispose of the plant material off-site. Do not put in a compost pile.
Slug or snails
Slug or snails Slug or snails
Slug or snails
Snails are a class of mollusks with hard shells into which their soft bodies can retract. Slugs are similar soft, fleshy mollusks but lack the shells. Both nibble at leaves and are regularly seen in wet or rainy conditions.
Solutions: If your plant has a serious problem: Choose commercial slug and snail baits. Those with iron phosphate as the active ingredient are fairly effective, killing them within a few days. These are considered safer for animals than baits containing metaldehyde. Baits should be spread out around plants at night and cleared away in the morning along with any dead pests as they can be toxic to birds and pets. If it is a less serious case, there are a number of organic approaches: Eliminate their hiding spots. It's the easiest way to control slugs and snails. Thick weeds, unused flower pots, boards, or stones are their favorite hiding spots. Hand-pick. You can also follow up with searching for them with a flashlight at night and picking them off plants. Board trap. Trap them by slightly propping up one end of a small board in your garden which will give them a place to hide (remove it and dispose of the pests during the day) Beer trap. Place a shallow dish of either beer or a mixture of 1 cup water with 1 teaspoon each active dry yeast and sugar buried up to the rim in your garden’s soil. Pests will fall in and drown.
Leaf rot
Leaf rot Leaf rot
Leaf rot
This pathogen can cause the leaves to rot.
Solutions: Bacterial infections need to be treated quickly to prevent the spread to neighboring, healthy plants, potentially wiping out large sections of your indoor or outdoor garden. In mild cases: Use sterilized (10% bleach solution) pruning shears or scissors to remove any infected plant parts, making sure to dispose of them off site. Use a copper-based bactericide to treat the unaffected foliage, as well as the soil, and neighboring plants. Follow the manufacturer’s rate and timing directions found on the product label. In severe cases, where more than half the leaves are affected: Remove all of the infected plants from the garden, disposing of them off site. Treat the soil and neighboring plants using a copper-based bactericide. Follow the manufacturer’s rate and timing directions found on the product label.
close
plant poor
Leaf rot
Overview
Symptom
Causes
Treatment
Prevention
Active Period
What is Leaf rot Disease on Canna lilies 'Pretoria'?
What is Leaf rot Disease on Canna lilies 'Pretoria'?
Leaf rot disease in Canna lilies 'Pretoria' results from fungal pathogens, characterized by decaying and shriveling foliage that stifles plant growth. Pertinent control and preventive mechanisms can minimize its spread and adverse implications.
Symptom Analysis
Symptom Analysis
Initial symptoms on Canna lilies 'Pretoria' include yellowing of leaves, followed by browning and wilting. Over time, leaves decay and disintegrate, possibly extending to the stems in severe cases.
What Causes Leaf rot Disease on Canna lilies 'Pretoria'?
What Causes Leaf rot Disease on Canna lilies 'Pretoria'?
1
Fungal pathogens
The primary perpetrators are fungi, including Phyllosticta spp., and Fusarium spp., which thrive in humid conditions and can infect the plants via the soil or airborne spores.
2
Poor environmental Factors
Conditions like waterlogged soil, poor air circulation, and low light levels often exacerbate fungal growth, triggering leaf rot disease.
How to Treat Leaf rot Disease on Canna lilies 'Pretoria'?
How to Treat Leaf rot Disease on Canna lilies 'Pretoria'?
1
Non pesticide
Prune infected foliage: Remove and dispose of infected leaves and stems immediately to prevent fungal spread.

Optimize watering: Ensure no waterlogging by watering at the base to keep foliage dry and maintaining good soil drainage.
2
Pesticide
Fungicide application: Apply a suitable fungicide following the manufacturer’s instructions, focusing on affected areas and surrounding foliage.
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qrcode
Scan the QR code with your phone camera to download the app
Flower withering
plant poor
Flower withering
Flowers may dry out due to a sudden change in environment or because the plant has completed its normal flowering period.
Overview
Overview
Flower withering occurs when flowers become weak, droopy, wilted, or faded until they can’t be revived. During withering, they begin to wrinkle and shrink until the flower becomes completely dry or dead.
Any flowers, regardless of the plant type or the climate they are grown in, are susceptible to withering. It is a worldwide problem across houseplants, herbs, flowering ornamentals, trees, shrubs, garden vegetables, and food crops.
Unlike wilting—which withering is often confused with—withering can be caused by different things and is often due to more than a lack of water. Withering can be fatal in severe cases.
Symptom Analysis
Symptom Analysis
Flower withering progresses from very mild cases to severe occurrences that kill the flower. The severity of the symptoms is related to the cause and how long the condition is allowed to progress before action is taken.
  • Wilted, droopy flowers
  • Petals and leaves begin to wrinkle
  • Brown papery streaks or spots appear on the petals and leaf tips
  • Flowerhead shrink in size
  • Petal color fades
  • Yellowing leaves
  • Complete death of the flower
Disease Cause
Disease Cause
The main causes of flower withering include natural age progress, lack of water, nutritional deficiencies, and bacterial or fungal diseases. It’s critical to determine the underlying cause when flower withering is noticed. This will guide the best course of action, if treatment is possible.
Check the soil for moisture and then closely examine the entire plant for signs of nutrient deficiencies. If neither of those appears to be the cause then cut open the stem below a flower. If a cross-section reveals brown or rust-colored stains it is safe to assume that this is a bacterial or fungal infection.
If the flower is nearing the end of its normal lifespan, genetic coding within the plant increases the production of ethylene, a phytohormone that controls senescence, or cell aging and death. Cell division stops and the plant begins breaking down resources within the flower to use in other parts of the plant.
In all other cases, flower withering happens when the plant seals off the stem as a defense mechanism, stopping transport within the vascular system. This prevents further water loss through the flowers but also stops bacteria and fungi from moving to healthy parts of the plant. Once water and nutrient transport stops, the flower begins to wither and ultimately die.
Continue reading in our app - it's better
A database of 400000+ plants and unlimited guides at your fingertips...
qrcode
Scan the QR code with your phone camera to download the app
Slug or snails
plant poor
Slug or snails
Snails are a class of mollusks with hard shells into which their soft bodies can retract. Slugs are similar soft, fleshy mollusks but lack the shells. Both nibble at leaves and are regularly seen in wet or rainy conditions.
Symptom Analysis
Symptom Analysis
Slugs and snails, two closely related pests, cause a great deal of feeding damage in gardens worldwide. They have rasping mouths that tear holes in leaves and flowers and are capable of consuming small plants entirely. They favor humid conditions, which means that they are generally active at night or on cloudy and rainy days.
Solutions
Solutions
If your plant has a serious problem:
  1. Choose commercial slug and snail baits. Those with iron phosphate as the active ingredient are fairly effective, killing them within a few days. These are considered safer for animals than baits containing metaldehyde.
  2. Baits should be spread out around plants at night and cleared away in the morning along with any dead pests as they can be toxic to birds and pets.
If it is a less serious case, there are a number of organic approaches:
  1. Eliminate their hiding spots. It's the easiest way to control slugs and snails. Thick weeds, unused flower pots, boards, or stones are their favorite hiding spots.
  2. Hand-pick. You can also follow up with searching for them with a flashlight at night and picking them off plants.
  3. Board trap. Trap them by slightly propping up one end of a small board in your garden which will give them a place to hide (remove it and dispose of the pests during the day)
  4. Beer trap. Place a shallow dish of either beer or a mixture of 1 cup water with 1 teaspoon each active dry yeast and sugar buried up to the rim in your garden’s soil. Pests will fall in and drown.
Prevention
Prevention
To prevent future damage, there are a number of effective non-chemical measures.
  1. Create a gritty barrier. You can use agricultural-grade diatomaceous earth, corn or wheat bran, or coffee grounds on the soil around your plant; you must replenish it after it rains.
  2. Set up a copper barrier. Snails and slugs can’t cross copper so copper tape can be made into a “fence” to protect your individual plant or seedlings.
Continue reading in our app - it's better
A database of 400000+ plants and unlimited guides at your fingertips...
qrcode
Scan the QR code with your phone camera to download the app
Leaf rot
plant poor
Leaf rot
This pathogen can cause the leaves to rot.
Overview
Overview
Leaf rot is very common among both house plants and garden plants. It affects foliage and occurs mainly when the leaves become wet due to rain or misting by the gardener. The cause is fungal disease and this is facilitated by the fungal spores adhering to wet leaves then penetrating the leaf and expanding rapidly. Damp conditions and poor air circulation will increase chances of infection taking place. Another factor are leaves that are damaged or have been penetrated by sap sucking insects that facilitate plant penetration.
Symptom Analysis
Symptom Analysis
  1. Spores are able to cling to a damp leaf and penetrate, often through an existing wound.
  2. A small dark brown mark appears which expands rapidly as sporulation starts to take place.
  3. Quite quickly these bull's eye like circles can link together and the whole leaf turns dark and loses texture.
  4. Leaf drop occurs.
Disease Cause
Disease Cause
These symptoms are caused by a bacterial infection invading the plant. Bacteria from many sources in the environment (air, water, soil, diseased plants) enter a plant through wounds, or in some cases the stomata when they are open. Once inside the leaf tissue, the bacteria feed and reproduce quickly, breaking down healthy leaves.
Bacterial infections threaten most plant species, and are more prominent in wet weather that more easily transfers the bacteria from plant to plant, or from soil to plant.
Continue reading in our app - it's better
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Scan the QR code with your phone camera to download the app
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More Info on Canna Lilies 'pretoria' Growth and Care

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Feedback
Common Pests & Diseases
Leaf rot
Leaf rot disease in Canna lilies 'Pretoria' results from fungal pathogens, characterized by decaying and shriveling foliage that stifles plant growth. Pertinent control and preventive mechanisms can minimize its spread and adverse implications.
Read More
Yellow edges
Yellow edges is a plant disease that impairs the aesthetics and vitality of Canna lilies 'Pretoria'. Manifested as yellowing edges on leaves, the disease reduces plant vigour. The condition can be managed by precise care and disease control practices.
Read More
Leaf tip withering
Leaf tip withering is a condition causing the tips of Canna lilies 'Pretoria''s leaves to brown and curl upwards, disrupting the overall growth and beauty of the plant. Caused by various factors, the disease can be effectively managed and prevented with appropriate care and treatment.
Read More
Dark blotch
Dark blotch is a fungal disease affecting Canna lilies 'Pretoria', leading to dark, irregular spots on leaves and stems. The disease belittles the plant's aesthetic value, reduces growth, and can potentially lead to plant death if left untreated.
Read More
Spots
Spots' is a common disease affecting the Canna lilies 'Pretoria', characterized by blemished foliage and a decline in plant vitality. It's primarily caused by fungal pathogens and can severely impair the plant's aesthetic appeal and overall health.
Read More
Leaf curling
Leaf curling is a common plant disease affecting Canna lilies 'Pretoria'. This disease causes severe deformation of leaves, disrupting essential photosynthetic activities. Infected plants endure stunted growth, affecting their overall health and aesthetic presence.
Read More
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More About How-Tos
Canna lilies 'Pretoria'
Canna lilies 'Pretoria'
Canna lilies 'Pretoria'
Canna 'Pretoria'
Hardiness Zones
Hardiness Zones
8 to 12
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Care Guide for Canna lilies 'Pretoria'

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Key Facts About Canna lilies 'Pretoria'

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Feedback
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Attributes of Canna lilies 'Pretoria'

Lifespan
Perennial
Plant Type
Herb
Plant Height
1.5 m
Spread
50 cm
Leaf Color
Yellow
Green
Flower Size
13 cm to 15 cm
Flower Color
Orange
Leaf type
Semi-evergreen
Ideal Temperature
15 - 38 ℃
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Scientific Classification of Canna lilies 'Pretoria'

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pests

Common Pests & Diseases About Canna lilies 'Pretoria'

feedback
Feedback
feedback
Common issues for Canna lilies 'Pretoria' based on 10 million real cases
Leaf rot
Leaf rot disease in Canna lilies 'Pretoria' results from fungal pathogens, characterized by decaying and shriveling foliage that stifles plant growth. Pertinent control and preventive mechanisms can minimize its spread and adverse implications.
Learn More About the Leaf rot more
Flower withering
Flower withering Flower withering Flower withering
Flowers may dry out due to a sudden change in environment or because the plant has completed its normal flowering period.
Solutions: If flower withering is a natural progression due to age, there is nothing that can be done to slow or stop the process. Once hormones within the plant begin the process of senescence, it’s irreversible. For lack of water, immediately water the plant using room temperature rainwater, bottled spring water, or filtered tap water. Water container plants until excess water drains out the bottom; water in-ground plants until the soil is soaked but there isn’t standing water on the surface. In the event of nutritional deficiencies, the best solution is to use a granular or water-soluble liquid fertilizer, and apply it to the soil at about half the recommended dosage. Keep it off the leaves and make sure granular products are watered into the soil well. If the plant is infected with a bacterial or fungal pathogen, there is no course of treatment that cures the diseased plants. The best solution is to remove the infected plants and dispose of the plant material off-site. Do not put in a compost pile.
Learn More About the Flower withering more
Slug or snails
Slug or snails Slug or snails Slug or snails
Snails are a class of mollusks with hard shells into which their soft bodies can retract. Slugs are similar soft, fleshy mollusks but lack the shells. Both nibble at leaves and are regularly seen in wet or rainy conditions.
Solutions: If your plant has a serious problem: Choose commercial slug and snail baits. Those with iron phosphate as the active ingredient are fairly effective, killing them within a few days. These are considered safer for animals than baits containing metaldehyde. Baits should be spread out around plants at night and cleared away in the morning along with any dead pests as they can be toxic to birds and pets. If it is a less serious case, there are a number of organic approaches: Eliminate their hiding spots. It's the easiest way to control slugs and snails. Thick weeds, unused flower pots, boards, or stones are their favorite hiding spots. Hand-pick. You can also follow up with searching for them with a flashlight at night and picking them off plants. Board trap. Trap them by slightly propping up one end of a small board in your garden which will give them a place to hide (remove it and dispose of the pests during the day) Beer trap. Place a shallow dish of either beer or a mixture of 1 cup water with 1 teaspoon each active dry yeast and sugar buried up to the rim in your garden’s soil. Pests will fall in and drown.
Learn More About the Slug or snails more
Leaf rot
Leaf rot Leaf rot Leaf rot
This pathogen can cause the leaves to rot.
Solutions: Bacterial infections need to be treated quickly to prevent the spread to neighboring, healthy plants, potentially wiping out large sections of your indoor or outdoor garden. In mild cases: Use sterilized (10% bleach solution) pruning shears or scissors to remove any infected plant parts, making sure to dispose of them off site. Use a copper-based bactericide to treat the unaffected foliage, as well as the soil, and neighboring plants. Follow the manufacturer’s rate and timing directions found on the product label. In severe cases, where more than half the leaves are affected: Remove all of the infected plants from the garden, disposing of them off site. Treat the soil and neighboring plants using a copper-based bactericide. Follow the manufacturer’s rate and timing directions found on the product label.
Learn More About the Leaf rot more
close
plant poor
Leaf rot
Overview
Symptom
Causes
Treatment
Prevention
Active Period
What is Leaf rot Disease on Canna lilies 'Pretoria'?
What is Leaf rot Disease on Canna lilies 'Pretoria'?
Leaf rot disease in Canna lilies 'Pretoria' results from fungal pathogens, characterized by decaying and shriveling foliage that stifles plant growth. Pertinent control and preventive mechanisms can minimize its spread and adverse implications.
Symptom Analysis
Symptom Analysis
Initial symptoms on Canna lilies 'Pretoria' include yellowing of leaves, followed by browning and wilting. Over time, leaves decay and disintegrate, possibly extending to the stems in severe cases.
What Causes Leaf rot Disease on Canna lilies 'Pretoria'?
What Causes Leaf rot Disease on Canna lilies 'Pretoria'?
1
Fungal pathogens
The primary perpetrators are fungi, including Phyllosticta spp., and Fusarium spp., which thrive in humid conditions and can infect the plants via the soil or airborne spores.
2
Poor environmental Factors
Conditions like waterlogged soil, poor air circulation, and low light levels often exacerbate fungal growth, triggering leaf rot disease.
How to Treat Leaf rot Disease on Canna lilies 'Pretoria'?
How to Treat Leaf rot Disease on Canna lilies 'Pretoria'?
1
Non pesticide
Prune infected foliage: Remove and dispose of infected leaves and stems immediately to prevent fungal spread.

Optimize watering: Ensure no waterlogging by watering at the base to keep foliage dry and maintaining good soil drainage.
2
Pesticide
Fungicide application: Apply a suitable fungicide following the manufacturer’s instructions, focusing on affected areas and surrounding foliage.
Continue reading in our app - it's better
A database of 400000+ plants
unlimited guides at your fingertips...
close
Flower withering
plant poor
Flower withering
Flowers may dry out due to a sudden change in environment or because the plant has completed its normal flowering period.
Overview
Overview
Flower withering occurs when flowers become weak, droopy, wilted, or faded until they can’t be revived. During withering, they begin to wrinkle and shrink until the flower becomes completely dry or dead.
Any flowers, regardless of the plant type or the climate they are grown in, are susceptible to withering. It is a worldwide problem across houseplants, herbs, flowering ornamentals, trees, shrubs, garden vegetables, and food crops.
Unlike wilting—which withering is often confused with—withering can be caused by different things and is often due to more than a lack of water. Withering can be fatal in severe cases.
Symptom Analysis
Symptom Analysis
Flower withering progresses from very mild cases to severe occurrences that kill the flower. The severity of the symptoms is related to the cause and how long the condition is allowed to progress before action is taken.
  • Wilted, droopy flowers
  • Petals and leaves begin to wrinkle
  • Brown papery streaks or spots appear on the petals and leaf tips
  • Flowerhead shrink in size
  • Petal color fades
  • Yellowing leaves
  • Complete death of the flower
Disease Cause
Disease Cause
The main causes of flower withering include natural age progress, lack of water, nutritional deficiencies, and bacterial or fungal diseases. It’s critical to determine the underlying cause when flower withering is noticed. This will guide the best course of action, if treatment is possible.
Check the soil for moisture and then closely examine the entire plant for signs of nutrient deficiencies. If neither of those appears to be the cause then cut open the stem below a flower. If a cross-section reveals brown or rust-colored stains it is safe to assume that this is a bacterial or fungal infection.
If the flower is nearing the end of its normal lifespan, genetic coding within the plant increases the production of ethylene, a phytohormone that controls senescence, or cell aging and death. Cell division stops and the plant begins breaking down resources within the flower to use in other parts of the plant.
In all other cases, flower withering happens when the plant seals off the stem as a defense mechanism, stopping transport within the vascular system. This prevents further water loss through the flowers but also stops bacteria and fungi from moving to healthy parts of the plant. Once water and nutrient transport stops, the flower begins to wither and ultimately die.
Solutions
Solutions
If flower withering is a natural progression due to age, there is nothing that can be done to slow or stop the process. Once hormones within the plant begin the process of senescence, it’s irreversible.
For lack of water, immediately water the plant using room temperature rainwater, bottled spring water, or filtered tap water. Water container plants until excess water drains out the bottom; water in-ground plants until the soil is soaked but there isn’t standing water on the surface.
In the event of nutritional deficiencies, the best solution is to use a granular or water-soluble liquid fertilizer, and apply it to the soil at about half the recommended dosage. Keep it off the leaves and make sure granular products are watered into the soil well.
If the plant is infected with a bacterial or fungal pathogen, there is no course of treatment that cures the diseased plants. The best solution is to remove the infected plants and dispose of the plant material off-site. Do not put in a compost pile.
Prevention
Prevention
This is definitely one of those instances where prevention is more effective than cure. Here are some preventative measures for avoiding premature flower withering.
  • Water plants according to their needs -- either keep the soil slightly moist or allow the top inch or two to dry out before watering again.
  • Fertilize lightly on a consistent basis, depending upon the plant’s growth. Quick-growing plants and those that flower or develop fruit will need more frequent fertilizing than slow-growing plants.
  • Purchase plants that are certified disease- or pathogen-free.
  • Look for disease-resistant cultivars.
  • Isolate plants showing disease symptoms to prevent the spread to neighboring plants.
  • Practice good plant hygiene by removing any fallen plant material as soon as possible.
Continue reading in our app - it's better
A database of 400000+ plants
unlimited guides at your fingertips...
close
Slug or snails
plant poor
Slug or snails
Snails are a class of mollusks with hard shells into which their soft bodies can retract. Slugs are similar soft, fleshy mollusks but lack the shells. Both nibble at leaves and are regularly seen in wet or rainy conditions.
Symptom Analysis
Symptom Analysis
Slugs and snails, two closely related pests, cause a great deal of feeding damage in gardens worldwide. They have rasping mouths that tear holes in leaves and flowers and are capable of consuming small plants entirely. They favor humid conditions, which means that they are generally active at night or on cloudy and rainy days.
Solutions
Solutions
If your plant has a serious problem:
  1. Choose commercial slug and snail baits. Those with iron phosphate as the active ingredient are fairly effective, killing them within a few days. These are considered safer for animals than baits containing metaldehyde.
  2. Baits should be spread out around plants at night and cleared away in the morning along with any dead pests as they can be toxic to birds and pets.
If it is a less serious case, there are a number of organic approaches:
  1. Eliminate their hiding spots. It's the easiest way to control slugs and snails. Thick weeds, unused flower pots, boards, or stones are their favorite hiding spots.
  2. Hand-pick. You can also follow up with searching for them with a flashlight at night and picking them off plants.
  3. Board trap. Trap them by slightly propping up one end of a small board in your garden which will give them a place to hide (remove it and dispose of the pests during the day)
  4. Beer trap. Place a shallow dish of either beer or a mixture of 1 cup water with 1 teaspoon each active dry yeast and sugar buried up to the rim in your garden’s soil. Pests will fall in and drown.
Prevention
Prevention
To prevent future damage, there are a number of effective non-chemical measures.
  1. Create a gritty barrier. You can use agricultural-grade diatomaceous earth, corn or wheat bran, or coffee grounds on the soil around your plant; you must replenish it after it rains.
  2. Set up a copper barrier. Snails and slugs can’t cross copper so copper tape can be made into a “fence” to protect your individual plant or seedlings.
Continue reading in our app - it's better
A database of 400000+ plants
unlimited guides at your fingertips...
close
Leaf rot
plant poor
Leaf rot
This pathogen can cause the leaves to rot.
Overview
Overview
Leaf rot is very common among both house plants and garden plants. It affects foliage and occurs mainly when the leaves become wet due to rain or misting by the gardener. The cause is fungal disease and this is facilitated by the fungal spores adhering to wet leaves then penetrating the leaf and expanding rapidly. Damp conditions and poor air circulation will increase chances of infection taking place. Another factor are leaves that are damaged or have been penetrated by sap sucking insects that facilitate plant penetration.
Symptom Analysis
Symptom Analysis
  1. Spores are able to cling to a damp leaf and penetrate, often through an existing wound.
  2. A small dark brown mark appears which expands rapidly as sporulation starts to take place.
  3. Quite quickly these bull's eye like circles can link together and the whole leaf turns dark and loses texture.
  4. Leaf drop occurs.
Disease Cause
Disease Cause
These symptoms are caused by a bacterial infection invading the plant. Bacteria from many sources in the environment (air, water, soil, diseased plants) enter a plant through wounds, or in some cases the stomata when they are open. Once inside the leaf tissue, the bacteria feed and reproduce quickly, breaking down healthy leaves.
Bacterial infections threaten most plant species, and are more prominent in wet weather that more easily transfers the bacteria from plant to plant, or from soil to plant.
Solutions
Solutions
Bacterial infections need to be treated quickly to prevent the spread to neighboring, healthy plants, potentially wiping out large sections of your indoor or outdoor garden.
In mild cases: Use sterilized (10% bleach solution) pruning shears or scissors to remove any infected plant parts, making sure to dispose of them off site. Use a copper-based bactericide to treat the unaffected foliage, as well as the soil, and neighboring plants. Follow the manufacturer’s rate and timing directions found on the product label.
In severe cases, where more than half the leaves are affected: Remove all of the infected plants from the garden, disposing of them off site. Treat the soil and neighboring plants using a copper-based bactericide. Follow the manufacturer’s rate and timing directions found on the product label.
Prevention
Prevention
  1. Clean up garden debris at the end of the season, especially if it contains any diseased plant tissue. Diseases can overwinter from season to season and infect new plants.
  2. Avoid overhead watering to prevent transferring pathogens from one plant to another, and to keep foliage dry.
  3. Mulch around the base of plants to prevent soil-borne bacteria from splashing up onto uninfected plants.
  4. Sterilize cutting tools using a 10% bleach solution when gardening and moving from one plant to another.
  5. Do not work in your garden when it is wet.
  6. Rotate crops to prevent the buildup of bacteria in one site due to continuous cropping.
  7. Use a copper or streptomycin-containing bactericide in early spring to prevent infection. Read label directions carefully as they are not suitable for all plants.
  8. Ensure plants are well spaced and thin leaves on densely leaved plants so that air circulation is maximised.
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More Info on Canna Lilies 'pretoria' Growth and Care

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Common Pests & Diseases
Leaf rot
Leaf rot disease in Canna lilies 'Pretoria' results from fungal pathogens, characterized by decaying and shriveling foliage that stifles plant growth. Pertinent control and preventive mechanisms can minimize its spread and adverse implications.
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Yellow edges
Yellow edges is a plant disease that impairs the aesthetics and vitality of Canna lilies 'Pretoria'. Manifested as yellowing edges on leaves, the disease reduces plant vigour. The condition can be managed by precise care and disease control practices.
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Leaf tip withering
Leaf tip withering is a condition causing the tips of Canna lilies 'Pretoria''s leaves to brown and curl upwards, disrupting the overall growth and beauty of the plant. Caused by various factors, the disease can be effectively managed and prevented with appropriate care and treatment.
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Dark blotch
Dark blotch is a fungal disease affecting Canna lilies 'Pretoria', leading to dark, irregular spots on leaves and stems. The disease belittles the plant's aesthetic value, reduces growth, and can potentially lead to plant death if left untreated.
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Spots
Spots' is a common disease affecting the Canna lilies 'Pretoria', characterized by blemished foliage and a decline in plant vitality. It's primarily caused by fungal pathogens and can severely impair the plant's aesthetic appeal and overall health.
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Leaf curling
Leaf curling is a common plant disease affecting Canna lilies 'Pretoria'. This disease causes severe deformation of leaves, disrupting essential photosynthetic activities. Infected plants endure stunted growth, affecting their overall health and aesthetic presence.
 detail
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