Insect & Disease
Resource Center

Signs of pests and diseases will vary from tree to tree. Search our database of pests and diseases for symptoms, damages, life cycle, management, and control information.

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Damage & Symptoms
Pest And Disease Canker Banner 1440X500
Trunk or Bark Damage
Fungal Cankers On Trees
Cankers are caused by various species of fungi that infect wounded or stressed trees. The canker itself is the dead area on the bark that can be found on the trunk or branches.
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Pest And Disease Dryads Saddle Banner 1440X500
Mold or Fungus
Dryad's Saddle Mushroom
Dryad’s saddle, also known as pheasant’s back, is a large, scaled cap mushroom that can decay dead trees and the sapwood of living trees.
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Pest And Disease Bacterial Leaf Scorch Banner 1440X500
Leaf or Needle Dropping
Bacterial Leaf Scorch
Bacterial leaf scorch, also known as Marginal leaf burn, is a chronic and systemic disease mostly affecting oaks and maples.
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IMG 5584 Bark Beetles Under The Bark TW
Dieback or Thinning Canopy
Bark Beetle Management
Bark beetles are tiny insects that feed under the bark of trees and disrupt the vascular system. There are numerous species that are pests of landscape trees worldwide.
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Pest And Disease Black Vine Weevil Banner 1440X500
Holes or Skeletonization in Leaves
Black Vine Weevil
The black vine weevil is a destructive insect that kills host plants by feeding on their foliage. Larvae are white, C-shaped grubs that feed on plant roots and bark cambium, resulting in yellowing and wilting of foliage, and plant death.
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Pest And Disease Center Gray Snow Moldt Banner 1440X500
Mold or Fungus
Gray Snow Mold
Gray snow mold is a fungal disease that attacks turfgrass in areas where there are extended periods of snow cover. It is easier to manage if treated in a timely manner but can be fatal to turfgrass if left untreated.
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5369697 LGPT Japanese Maple Scale Horiz
Trunk or Bark Damage
Japanese Maple Scale
Japanese maple scale is an armored insect pest that uses piercing/sucking mouthparts to feed on plant juices.
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Magnolia Scale Adults
Mold or Fungus
Magnolia Scale
Magnolia scale, This the largest of the soft scale. Adult female scales are relatively large, up to ½ inch and peach to gray in color, often with a fuzzy white covering. Feeding by the insect can stress trees, resulting in twig dieback and a decline in tree health.
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