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
Armyworms Banner 1440X500
Brown, Spotted, or Patch Grass on Lawn
Fall Armyworms
Fall armyworm caterpillars eat the leaves and stems of turfgrasses, but typically do not destroy the crown of the plant. Early feeding damage can resemble drought stressed turf, but can quickly progress to complete browning of the entire stand when caterpillars are present in large numbers.
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Pest And Disease Apple Scab Banner 1440X500
Leaf or Needle Discoloration
Apple Scab
Apple scab is a foliar leaf disease caused by the fungus Venturia inaequalis.
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Pest And Disease Armillaria Mushrooms Banner 1440X500
Mold or Fungus
Armillaria Root Rot
Armillaria root rot, also known as ‘honey fungus’ or ‘shoestring root rot’, is a group of decay fungi comprised of at least 11 species. It affects both landscape and natural habitat plants throughout the United States.
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Pest And Disease Center Bronze Birch Borer Banner 1440X500
Trunk or Bark Damage
Bronze Birch Borer
The bronze birch borer (Agrilus anxius) is a destructive beetle that feeds on birch trees. Signs of this pest include off-color and sparse foliage in the upper canopy of the birch tree, dead branches in the upper crown and swollen ridges on the trunk and branches.
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Pest And Disease Center Elm Leaf Beetle Banner 1440X500
Leaf or Needle Discoloration
Elm Leaf Beetle
When populations are large, elm leaf beetle larvae and adults can completely defoliate elms. Adults chew small, circular holes. Infested trees appear drought-stricken and brown or scorched.
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Pest And Disease Northern Tooth Fungus Banner 1440X500
Mold or Fungus
Northern Tooth Fungus
Northern tooth fungus grows on living, deciduous trees. The fungus grows in shelves of fruiting bodies that overlap in clusters.
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Pest And Disease Oak Mazegill Banner 1440X500
Mold or Fungus
Oak Mazegill Mushroom
Oak mazegill is a mushroom that grows in heartwood or already rotting wood. These types of stemless mushrooms are called conks.
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Pest And Disease Center Anthracnose Disease Of Deciduous Trees Banner 1440X500
Mold or Fungus
Anthracnose Disease Of Deciduous Trees
Anthracnose is a common and destructive group of fungal pathogens that attack various shade trees.
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