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

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Pest And Disease Eastern Spruce Gall Adelgid Banner 1440X500
Growth on Foliage or Branch
Eastern Spruce Gall Adelgid
The Eastern spruce gall adelgid, Adelges abietis, is a soft-bodied, aphid-like insect that sucks plant juices. As immature adelgids feed, they form cone-shaped galls containing more adelgids. These galls can cause disfigurement and weaken trees, which may lead to their decline or death.
Pest And Disease Center Eastern Tent Caterpillar Banner 1440X500
Webs or Bags
Eastern Tent Caterpillar
The eastern tent caterpillar is a pest native to the United States whose presence was first recorded in the mid-1600s. Found in the eastern and central United States, it has been seen as far west as the Rocky Mountains. It appears in large numbers, generally every ten or so years.
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.
Pest And Disease Elongate Hemlock Scale Banner 1440X500
Leaf or Needle Discoloration
Elongate Hemlock Scale
Elongate hemlock scale is an armored scale pest with a hard, waxy coating. Small, oblong, flattened insects appear on lower needle surfaces.
Pest And Disease Center Eab Banner 1440X500
Trunk or Bark Damage
Emerald Ash Borer
Emerald ash borer (EAB) is an Asian beetle that threatens the existence of ash trees throughout North America. These insect pests have killed millions of ash trees in urban areas, woodlots, and nurseries, spreading via infested nursery stock and firewood.
Pest And Disease Center Eriophyid Mites Banner 1440X500
Bumps or Blisters on Leaf or Needle
Eriophyid Mites
Eriophyid mites are the smallest arthropod pests on plants. Two common eriophyid mites are ash flower gall mite (Eriophyes fraxiniflora) and pine bud mite/needle sheath mite (Trisetacus pini).
Pest And Disease Center Euonymus Scale Banner 1440X500
Leaf or Needle Discoloration
Euonymus Scale
Pest And Disease Center Fairy Rings Banner 1440X500
Mold or Fungus
Fairy Rings
Signs of fairy ring include a dark green circle or arc of rapidly growing turfgrasses, sometimes lined with a band of dead grass. Occasionally, mushrooms or puffballs form along the ring. Fairy rings develop most commonly in spring and fall when there is excess moisture.
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