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Korean fir 'Silver Show'
Korean fir 'Silver Show'
Korean fir 'Silver Show'
Abies koreana 'Silver Show'
Hardiness Zones
Hardiness Zones
5 to 7
care guide

Care Guide for Korean fir 'Silver Show'

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Watering Care
Watering Care
Details on Watering Care Watering Care
Fertilizing Care
Fertilizing Care
Details on Fertilizing Care Fertilizing Care
Pruning
Pruning
Trim the dead, diseased, overgrown branches in winter.
Details on Pruning Pruning
Soil Care
Soil Care
Clay, Sandy loam, Acidic, Neutral
Details on Soil Care Soil Care
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Ideal Lighting
Full sun, Partial sun
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Korean fir 'Silver Show'
Water
Water
Every week
Sunlight
Sunlight
Full sun
Hardiness Zones
Hardiness Zones
5 to 7
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Questions About Korean fir 'Silver Show'

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Watering Watering Watering
Pruning Pruning Pruning
Sunlight Sunlight Sunlight
Temperature Temperature Temperature
Fertilizing Fertilizing Fertilizing
What is the best way to water my Korean fir 'Silver Show'?
If you decide to water your Korean fir 'Silver Show', you will be happy to find that it is a straightforward task. One of the easiest ways to water this tree is by simply turning on your garden hose and using it to soak the soil slowly. Your garden hose is the ideal watering tool to use for mature Korean fir 'Silver Show' trees, as large specimens may need a high volume of water during each watering. However, for smaller trees, you may get by by using a watering can or some other smaller watering tool. Also, you should try to avoid overhead watering as excessive moisture on this plant’s leaves can lead to disease, especially when the tree is young.
Read More more
What should I do if I water my Korean fir 'Silver Show' too much or too little?
At times, overwatering can be the result of poor soils. Mainly, if the soil in which your Korean fir 'Silver Show' grows does not allow water to drain effectively, the plant will likely begin to decline. If this is the case, you should either amend the soil to improve its drainage characteristics or transplant your Korean fir 'Silver Show' to a more favorable growing location. If you grow your Korean fir 'Silver Show' in a pot, this can also mean you may need to repot your plant with looser soils in a container that allows for better drainage. An overwatered plant may also contract diseases, which you should try to treat immediately. For an underwatered Korean fir 'Silver Show', the remedy is quite simple. Begin watering more often, and soon your plant will bounce back and return to full health. The easiest way to tell if you have overwatered your Korean fir 'Silver Show' is to observe the plant’s foliage. Specifically, looking at the new growth will give the clearest sign of whether this plant suffers from too much moisture. An overwatered Korean fir 'Silver Show' may produce new growth, but that new growth may be discolored or prone to easy breakage. Another sign that the soil for your Korean fir 'Silver Show' is too moist is if you notice standing water or that water is not draining quickly in your plant’s growing area. Underwatered Korean fir 'Silver Show' trees will also have symptoms present in the foliage. In this case, the leaves may become sparse, brown. Usually, Korean fir 'Silver Show' can grow well with rainfulls. If you see such symptoms on your plant, you should consider if there has been too much rain recently or constantly high temperatures, which will help you to make the correct judgment.
Read More more
How often should I water my Korean fir 'Silver Show'?
A mature Korean fir 'Silver Show' does not need much water at all. In most instances, this tree will become drought tolerant and survive off of nothing more than rainfall. At most, you’ll need to water this plant about once per week during the hottest months of the year, but during other seasons, you probably won’t need to water it at all. The exception to that rule is if you are dealing with a plant that has been newly planted. If that is the case, you should water regularly to maintain consistent soil moisture and help the roots establish themselves. With that said, the most important thing to remember when watering Korean fir 'Silver Show' is that this species does not tolerate standing water. As such, when in doubt, you should err on the side of not watering your Korean fir 'Silver Show' rather than risking watering it too much.
Read More more
How much water does my Korean fir 'Silver Show' need?
The height of summer is one of the few times that you’ll need to water your Korean fir 'Silver Show'. At that time of year, it is typical to give this plant about one inch of water per week. However, that amount can change depending on how much it has rained. If it has rained one inch or more that week, you won’t need to give any water to your Korean fir 'Silver Show'.newly planted Korean fir 'Silver Show' will need more water during the establishment period. Typically, this amounts to watering about once every one to two weeks for the first few growing seasons.
Read More more
How should I water my Korean fir 'Silver Show' through the seasons?
The Korean fir 'Silver Show' tree will need the most water during the summer months when the weather is the hottest. At that time, you should give this plant water about once per week in the absence of rainfall. During other times of the year, this plant will often survive with no water at all. In spring and fall, you might need to provide some water if the weather is exceptionally hot, but this is rare. Unlike many other plants, the Korean fir 'Silver Show' does not enter full dormancy in winter, which means that it will continue growing, during the coldest months. Still, the water needs during winter will remain quite low as the cool temperatures will not cause the soil to dry out quickly..
Read More more
How should I water my Korean fir 'Silver Show' at different growth stages?
Young Korean fir 'Silver Show' trees need significantly more water than those that are established. A newly planted tree should receive water at least weekly to ensure that the soil remains moist to facilitate root development. After the first growing season, your Korean fir 'Silver Show' should be well-adapted to its new growing location and should need much less water. At this time, you can begin following the standard instructions for watering this species, providing supplemental water about once per week during summer when it does not rain. Beyond that, there is no other time at which you’ll need to alter your watering habits based on the growth stages of the Korean fir 'Silver Show' tree.
Read More more
What's the difference between watering Korean fir 'Silver Show' indoors and outdoors?
It is far more common to grow the Korean fir 'Silver Show' in an outdoor growing location. However, it is also possible to grow this plant indoors in a container. In that scenario, one gardener often raise the Korean fir 'Silver Show' as the bonsai plant. Whether you grow this plant indoors or outdoors, you can expect its water needs to remain relatively similar. The one difference is that you may need to water an indoor Korean fir 'Silver Show' tree a bit more. Indoor plants won’t have access to rainfall during the summer. Also, indoor areas are often much drier than outdoor growing locations, and the size of the pots limits the water-retainability, which can lead to higher water needs.
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Key Facts About Korean fir 'Silver Show'

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Attributes of Korean fir 'Silver Show'

Lifespan
Perennial
Plant Type
Tree, Shrub
Plant Height
4.5 m
Spread
3 m
Leaf Color
Green
White
Gray
Silver
Fruit Color
Brown
Purple
Stem Color
Green
White
Leaf type
Evergreen
Ideal Temperature
5 - 32 ℃

Scientific Classification of Korean fir 'Silver Show'

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Common Pests & Diseases About Korean fir 'Silver Show'

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Bagworm moth
Bagworm moths are pests that particularly afflict Korean fir 'Silver Show', causing defoliation and potential death if infestations are severe. The larvae create spindle-shaped bags that hang from branches, severely impairing plant growth and aesthetics.
Longhorn beetles
Longhorn beetles Longhorn beetles
Longhorn beetles
The longhorn beetle is a medium- to large-sized insect with very long antennae and strong jaws. Both its adult and larval stages gnaw on tree trunks, leaving small, round holes.
Solutions: Some longhorn beetles species are native insects, and they cause little damage. Therefore, these don't warrant control. Other longhorn beetles species are invasive pests that were recently introduced from other areas. These species can cause a great deal of damage to hardwood trees. Apply an insecticide containing imidacloprid as a soil injection or trunk injection following product instructions. This will enter into new grow and kill adults who feed on foliage. This will not help save trees that are already infested with large amounts of larvae, but it will save trees located near an infested tree. Contact an arborist for best control practices regarding infected trees. To properly control longhorn beetles, all host plants in a given area must be treated. Contact a local extension agent or state agency. Tracking the spread of longhorn beetles is a key component of their control.
Branch blight
Branch blight Branch blight
Branch blight
Branch blight can cause lignified branches to dry up entirely and die.
Solutions: Inspect trees frequently, and remove any infected branches as soon as possible. Branch blight cannot be cured, so the only treatment is to prune the tree and monitor it carefully for signs of the disease. All affected parts of the tree should be removed, since blight can survive over the winter inside the plant’s tissues. Blight can become systemic in the tree, in which case the entire plant should be removed so it does not remain a host for the pathogen and allow it to spread.
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.
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plant poor
Bagworm moth
Overview
Symptom
Causes
Treatment
Prevention
Active Period
What is Bagworm moth Disease on Korean fir 'Silver Show'?
What is Bagworm moth Disease on Korean fir 'Silver Show'?
Bagworm moths are pests that particularly afflict Korean fir 'Silver Show', causing defoliation and potential death if infestations are severe. The larvae create spindle-shaped bags that hang from branches, severely impairing plant growth and aesthetics.
Symptom Analysis
Symptom Analysis
Infestations on Korean fir 'Silver Show' are marked by the presence of bag-like structures hanging from branches. Symptoms include needle loss, branch dieback, and in severe cases, the death of parts of the plant.
What Causes Bagworm moth Disease on Korean fir 'Silver Show'?
What Causes Bagworm moth Disease on Korean fir 'Silver Show'?
1
Larvae
The bagworm moth lays eggs that hatch into larvae, which consume the needles of Korean fir 'Silver Show' and encase themselves in protective bags made from silk and plant material.
How to Treat Bagworm moth Disease on Korean fir 'Silver Show'?
How to Treat Bagworm moth Disease on Korean fir 'Silver Show'?
1
Non pesticide
Physical removal: Handpick the bags from Korean fir 'Silver Show' during winter or early spring before larvae hatch.

Promote natural predators: Encourage birds or introduce parasitic wasps that prey on bagworm eggs and larvae.
2
Pesticide
Apply Bt (Bacillus thuringiensis): Use during the larval stages when the caterpillars are small and actively feeding.

Use systemic insecticides: Apply chemicals like acephate in early season to protect Korean fir 'Silver Show' throughout the growing season.
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Longhorn beetles
plant poor
Longhorn beetles
The longhorn beetle is a medium- to large-sized insect with very long antennae and strong jaws. Both its adult and larval stages gnaw on tree trunks, leaving small, round holes.
Overview
Overview
Longhorn beetles are characterized by extremely long antennae which are often as long as, or longer, than the beetle's body. Adult longhorn beetles vary in size, shape, and coloration, depending upon the species. They may be 6 to 76 mm long. The larvae are worm-like with a wrinkled, white to yellowish body and a brown head.
Longhorn beetles are active throughout the year, but adults are most active in the summer and fall. Larvae feed on wood throughout the year.
Both larvae and adults feed on woody tissue. Some of the most susceptible species include ash, birch, elm, poplar, and willow.
If left untreated, longhorn beetles can kill trees.
Symptom Analysis
Symptom Analysis
Longhorn beetles are attracted to wounded, dying, or freshly-cut hardwood trees. Adults lay their eggs in the spring, summer, and fall on the bark of greenwood. There may be sap around egg-laying sites.
Once the eggs hatch, larvae called round-headed borers burrow into the trunk to feed. They may tunnel for one to three years depending on the wood's nutritional content. As the larvae feed, they release sawdust-like frass at the base of the tree.
Eventually, the larvae turn into pupae and then adults. When the adults emerge, they leave 1 cm holes in the bark on their way out. Adults feed on leaves, bark, and shoots of trees before laying eggs.
After a few years of being fed upon by longhorn beetles, a tree will begin losing leaves. Eventually, it will die.
Solutions
Solutions
Some longhorn beetles species are native insects, and they cause little damage. Therefore, these don't warrant control.
Other longhorn beetles species are invasive pests that were recently introduced from other areas. These species can cause a great deal of damage to hardwood trees.
  • Apply an insecticide containing imidacloprid as a soil injection or trunk injection following product instructions. This will enter into new grow and kill adults who feed on foliage. This will not help save trees that are already infested with large amounts of larvae, but it will save trees located near an infested tree.
  • Contact an arborist for best control practices regarding infected trees.
  • To properly control longhorn beetles, all host plants in a given area must be treated.
  • Contact a local extension agent or state agency. Tracking the spread of longhorn beetles is a key component of their control.
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Branch blight
plant poor
Branch blight
Branch blight can cause lignified branches to dry up entirely and die.
Overview
Overview
"Blight" is an umbrella term used to describe a category of tree diseases caused by fungus or bacteria. Branch blight occurs when fungus attacks the branches and twigs of a tree, resulting in branches slowly dying off.
Branch blight can affect most species of trees to some degree, and it may be called by different names including twig blight or stem blight. It is caused by a variety of fungi which attack branches first, especially immature growth.
Blight usually occurs in warm, humid conditions, so is most common in the spring and summer months. Because specific environmental conditions are required, the frequency of branch blight can vary from year to year. This makes the disease hard to control, as it can spread between trees and affect multiple plants in a short period of time.
In the worst-case scenario, trees can lose significant portions of their foliage and fail to produce fruit. Young or unhealthy trees could die off completely.
Symptom Analysis
Symptom Analysis
The first symptoms of branch blight are that the emerging foliage turns brown or gray at the tips, especially on the smallest branches. Brown spots cover the entire surface of the leaves, eventually causing leaves and stems to shrivel and fall off. Over time, the dying tissue will spread toward the center of the plant. If left untreated, spores from the attacking fungus may appear on dying foliage within 3-4 weeks of the infection.
In some cases, lesions may form at the spot where the twig branches off from the healthy tissue. Branches may display girdling, which is a band of damaged tissue encircling the branch. An untreated tree will eventually lose all of its foliage and die.
Disease Cause
Disease Cause
  • Pathogens on young twigs and foliage cause disease
  • Stressed and unhealthy trees are more susceptible - root injury due to physical or insect damage, infection, or aging can prevent adequate absorption of water and nutrients
  • Extremely wet conditions including sprinkler watering can attract fungus
  • Fungi can be transmitted between nearby trees
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Fruit withering
plant poor
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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More Info on Korean Fir 'silver Show' Growth and Care

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Basic Care Guide
Common Pests & Diseases
Transplant
10-15 feet
Korean fir 'Silver Show' transplants best from early spring to late autumn due to moderate temperatures and soil moisture. Ideal locations are sunny spots with well-drained soil. Remember, always transplant when the tree is dormant for minimal stress.
Transplant Techniques
Pruning
Winter
Korean fir 'Silver Show' boasts striking silver-blue foliage and a compact structure. Prune korean fir 'Silver Show' during the dormant winter season to promote healthy growth and maintain shape. Focus on removing dead or damaged branches, and avoid heavy pruning to prevent stress. Light shaping can improve airflow and light penetration. Regular monitoring for any pests or diseases is beneficial. Pruning encourages a denser form, enhancing the plant's ornamental appeal while ensuring sustained vigor and health.
Pruning techniques
Propagation
Autumn,Winter
Korean fir 'Silver Show' is a cultivar of the Korean fir, known for its stunning silver-white needles. For successful propagation, use semi-hardwood cuttings from healthy plants. Select cuttings early in the day and treat with a rooting hormone to enhance root development. Ensure the growing medium is well-draining and maintain high humidity around the cuttings by using a humidity dome or frequent misting. This method encourages robust root growth, vital for the vitality of korean fir 'Silver Show'.
Propagation Techniques
Bagworm moth
Bagworm moths are pests that particularly afflict Korean fir 'Silver Show', causing defoliation and potential death if infestations are severe. The larvae create spindle-shaped bags that hang from branches, severely impairing plant growth and aesthetics.
Read More
Scale insect
Scale insects are sap-sucking pests that can severely infest Korean fir 'Silver Show', leading to leaf yellowing, stunted growth, and premature needle drop. Controlling them is crucial to prevent significant damage and potential dieback.
Read More
Dieback
Dieback is a debilitating disease affecting Korean fir 'Silver Show', characterized by progressive death of branches, diminishing the tree's aesthetic and health. It typically results from both biotic and abiotic causes, severely impacting Korean fir 'Silver Show''s survival and appearance.
Read More
Borer
Borer disease significantly impacts the vigor of Korean fir 'Silver Show', causing structural damage and eventually weakening the plant. Early detection and integrated management are essential for control.
Read More
Mealybug
Mealybug disease on Korean fir 'Silver Show' is characterized by sap-sucking insects infesting and damaging the foliage and stems. This pest commonly leads to stunted growth and can sometimes be fatal if severe infestations are left untreated.
Read More
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Korean fir 'Silver Show'
Korean fir 'Silver Show'
Korean fir 'Silver Show'
Abies koreana 'Silver Show'
Hardiness Zones
Hardiness Zones
5 to 7
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Care Guide for Korean fir 'Silver Show'

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Questions About Korean fir 'Silver Show'

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Watering Watering Watering
Pruning Pruning Pruning
Sunlight Sunlight Sunlight
Temperature Temperature Temperature
Fertilizing Fertilizing Fertilizing
What is the best way to water my Korean fir 'Silver Show'?
more
What should I do if I water my Korean fir 'Silver Show' too much or too little?
more
How often should I water my Korean fir 'Silver Show'?
more
How much water does my Korean fir 'Silver Show' need?
more
How should I water my Korean fir 'Silver Show' through the seasons?
more
How should I water my Korean fir 'Silver Show' at different growth stages?
more
What's the difference between watering Korean fir 'Silver Show' indoors and outdoors?
more
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plant_info

Key Facts About Korean fir 'Silver Show'

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Feedback
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Attributes of Korean fir 'Silver Show'

Lifespan
Perennial
Plant Type
Tree, Shrub
Plant Height
4.5 m
Spread
3 m
Leaf Color
Green
White
Gray
Silver
Fruit Color
Brown
Purple
Stem Color
Green
White
Leaf type
Evergreen
Ideal Temperature
5 - 32 ℃
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Scientific Classification of Korean fir 'Silver Show'

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Common Pests & Diseases About Korean fir 'Silver Show'

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Common issues for Korean fir 'Silver Show' based on 10 million real cases
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Plant disease auto-diagnose & prevention
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Bagworm moth
Bagworm moths are pests that particularly afflict Korean fir 'Silver Show', causing defoliation and potential death if infestations are severe. The larvae create spindle-shaped bags that hang from branches, severely impairing plant growth and aesthetics.
Learn More About the Bagworm moth more
Longhorn beetles
Longhorn beetles Longhorn beetles Longhorn beetles
The longhorn beetle is a medium- to large-sized insect with very long antennae and strong jaws. Both its adult and larval stages gnaw on tree trunks, leaving small, round holes.
Solutions: Some longhorn beetles species are native insects, and they cause little damage. Therefore, these don't warrant control. Other longhorn beetles species are invasive pests that were recently introduced from other areas. These species can cause a great deal of damage to hardwood trees. Apply an insecticide containing imidacloprid as a soil injection or trunk injection following product instructions. This will enter into new grow and kill adults who feed on foliage. This will not help save trees that are already infested with large amounts of larvae, but it will save trees located near an infested tree. Contact an arborist for best control practices regarding infected trees. To properly control longhorn beetles, all host plants in a given area must be treated. Contact a local extension agent or state agency. Tracking the spread of longhorn beetles is a key component of their control.
Learn More About the Longhorn beetles more
Branch blight
Branch blight Branch blight Branch blight
Branch blight can cause lignified branches to dry up entirely and die.
Solutions: Inspect trees frequently, and remove any infected branches as soon as possible. Branch blight cannot be cured, so the only treatment is to prune the tree and monitor it carefully for signs of the disease. All affected parts of the tree should be removed, since blight can survive over the winter inside the plant’s tissues. Blight can become systemic in the tree, in which case the entire plant should be removed so it does not remain a host for the pathogen and allow it to spread.
Learn More About the Branch blight 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
close
plant poor
Bagworm moth
Overview
Symptom
Causes
Treatment
Prevention
Active Period
What is Bagworm moth Disease on Korean fir 'Silver Show'?
What is Bagworm moth Disease on Korean fir 'Silver Show'?
Bagworm moths are pests that particularly afflict Korean fir 'Silver Show', causing defoliation and potential death if infestations are severe. The larvae create spindle-shaped bags that hang from branches, severely impairing plant growth and aesthetics.
Symptom Analysis
Symptom Analysis
Infestations on Korean fir 'Silver Show' are marked by the presence of bag-like structures hanging from branches. Symptoms include needle loss, branch dieback, and in severe cases, the death of parts of the plant.
What Causes Bagworm moth Disease on Korean fir 'Silver Show'?
What Causes Bagworm moth Disease on Korean fir 'Silver Show'?
1
Larvae
The bagworm moth lays eggs that hatch into larvae, which consume the needles of Korean fir 'Silver Show' and encase themselves in protective bags made from silk and plant material.
How to Treat Bagworm moth Disease on Korean fir 'Silver Show'?
How to Treat Bagworm moth Disease on Korean fir 'Silver Show'?
1
Non pesticide
Physical removal: Handpick the bags from Korean fir 'Silver Show' during winter or early spring before larvae hatch.

Promote natural predators: Encourage birds or introduce parasitic wasps that prey on bagworm eggs and larvae.
2
Pesticide
Apply Bt (Bacillus thuringiensis): Use during the larval stages when the caterpillars are small and actively feeding.

Use systemic insecticides: Apply chemicals like acephate in early season to protect Korean fir 'Silver Show' throughout the growing season.
Continue reading in our app - it's better
A database of 400000+ plants
unlimited guides at your fingertips...
close
Longhorn beetles
plant poor
Longhorn beetles
The longhorn beetle is a medium- to large-sized insect with very long antennae and strong jaws. Both its adult and larval stages gnaw on tree trunks, leaving small, round holes.
Overview
Overview
Longhorn beetles are characterized by extremely long antennae which are often as long as, or longer, than the beetle's body. Adult longhorn beetles vary in size, shape, and coloration, depending upon the species. They may be 6 to 76 mm long. The larvae are worm-like with a wrinkled, white to yellowish body and a brown head.
Longhorn beetles are active throughout the year, but adults are most active in the summer and fall. Larvae feed on wood throughout the year.
Both larvae and adults feed on woody tissue. Some of the most susceptible species include ash, birch, elm, poplar, and willow.
If left untreated, longhorn beetles can kill trees.
Symptom Analysis
Symptom Analysis
Longhorn beetles are attracted to wounded, dying, or freshly-cut hardwood trees. Adults lay their eggs in the spring, summer, and fall on the bark of greenwood. There may be sap around egg-laying sites.
Once the eggs hatch, larvae called round-headed borers burrow into the trunk to feed. They may tunnel for one to three years depending on the wood's nutritional content. As the larvae feed, they release sawdust-like frass at the base of the tree.
Eventually, the larvae turn into pupae and then adults. When the adults emerge, they leave 1 cm holes in the bark on their way out. Adults feed on leaves, bark, and shoots of trees before laying eggs.
After a few years of being fed upon by longhorn beetles, a tree will begin losing leaves. Eventually, it will die.
Solutions
Solutions
Some longhorn beetles species are native insects, and they cause little damage. Therefore, these don't warrant control.
Other longhorn beetles species are invasive pests that were recently introduced from other areas. These species can cause a great deal of damage to hardwood trees.
  • Apply an insecticide containing imidacloprid as a soil injection or trunk injection following product instructions. This will enter into new grow and kill adults who feed on foliage. This will not help save trees that are already infested with large amounts of larvae, but it will save trees located near an infested tree.
  • Contact an arborist for best control practices regarding infected trees.
  • To properly control longhorn beetles, all host plants in a given area must be treated.
  • Contact a local extension agent or state agency. Tracking the spread of longhorn beetles is a key component of their control.
Prevention
Prevention
  • Keeping trees healthy, uninjured, and unstressed will help prevent beetle infestation. Water trees appropriately, giving neither too much nor too little.
  • Check with local tree companies about which tree species have fewer problems.
  • Avoid moving firewood as this can introduce exotic longhorn beetles.
  • Routine spraying of persistent, broad-spectrum insecticides will help prevent re-infestation of previously affected trees or infestation of unaffected trees.
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Branch blight
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Branch blight
Branch blight can cause lignified branches to dry up entirely and die.
Overview
Overview
"Blight" is an umbrella term used to describe a category of tree diseases caused by fungus or bacteria. Branch blight occurs when fungus attacks the branches and twigs of a tree, resulting in branches slowly dying off.
Branch blight can affect most species of trees to some degree, and it may be called by different names including twig blight or stem blight. It is caused by a variety of fungi which attack branches first, especially immature growth.
Blight usually occurs in warm, humid conditions, so is most common in the spring and summer months. Because specific environmental conditions are required, the frequency of branch blight can vary from year to year. This makes the disease hard to control, as it can spread between trees and affect multiple plants in a short period of time.
In the worst-case scenario, trees can lose significant portions of their foliage and fail to produce fruit. Young or unhealthy trees could die off completely.
Symptom Analysis
Symptom Analysis
The first symptoms of branch blight are that the emerging foliage turns brown or gray at the tips, especially on the smallest branches. Brown spots cover the entire surface of the leaves, eventually causing leaves and stems to shrivel and fall off. Over time, the dying tissue will spread toward the center of the plant. If left untreated, spores from the attacking fungus may appear on dying foliage within 3-4 weeks of the infection.
In some cases, lesions may form at the spot where the twig branches off from the healthy tissue. Branches may display girdling, which is a band of damaged tissue encircling the branch. An untreated tree will eventually lose all of its foliage and die.
Disease Cause
Disease Cause
  • Pathogens on young twigs and foliage cause disease
  • Stressed and unhealthy trees are more susceptible - root injury due to physical or insect damage, infection, or aging can prevent adequate absorption of water and nutrients
  • Extremely wet conditions including sprinkler watering can attract fungus
  • Fungi can be transmitted between nearby trees
Solutions
Solutions
  • Inspect trees frequently, and remove any infected branches as soon as possible. Branch blight cannot be cured, so the only treatment is to prune the tree and monitor it carefully for signs of the disease.
  • All affected parts of the tree should be removed, since blight can survive over the winter inside the plant’s tissues.
  • Blight can become systemic in the tree, in which case the entire plant should be removed so it does not remain a host for the pathogen and allow it to spread.
Prevention
Prevention
  • Avoid purchasing trees with dead or dying growth.
  • Sterilize cutting tools frequently when pruning to avoid spreading fungus between plants.
  • Keep trees mulched and watered, especially during dry periods, to prevent stress.
  • Avoid splashing water on the leaves when watering, as wet foliage is attractive to fungi and bacteria.
  • When planting, allow enough room between trees that there will be sufficient air circulation for them to dry out. Crowding trees too close together can increase humidity and allow the fungi to transfer.
  • When conditions are wet and humid, a fungicide can be used on new growth.
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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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