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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 Mites Banner 1440X500
Leaf or Needle Discoloration
Mites
Mites are nearly invisible, but they can cause destruction that will surely be noticed on a variety of indoor and outdoor trees, shrubs and plants. Signs that mites are present include spotting, bronzing or yellowing of leaves and the presence of small webs between twigs.
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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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SAPW Infested Canary Island Date Palm
Leaf or Needle Discoloration
South American Palm Weevil
These beetles lay eggs in the growing point of the palm and when they hatch the large larvae feed on the growing point tissue (heart of palm).
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5402462 LGPT European Elm Scale Branch1
Substance on Leaf or Oozing
European Elm Scale
European elm scale (Gossyparia spuria) is a pest that feeds on elm tree twigs, branches and leaves, causing premature leaf drop and leaf yellowing. Heavily infested branches may die.
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