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 Crabgrass Banner 1440X500
Brown, Spotted, or Patch Grass on Lawn
Crabgrass
There are several species of crabgrass. Common crabgrass is one of the most undesirable and dominant weeds in home lawns. A lighter shade of green than typical turfgrasses, it has a coarse texture and clumpy appearance.
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Pest And Disease Dollar Spot Banner 1440X500
Brown, Spotted, or Patch Grass on Lawn
Dollar Spot Fungus
Dollar spot is caused by a fungus that causes blight to grass blades, but does not harm roots or crowns. Infections start as small circular areas about the size of a silver dollar, hence the name.
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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.
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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.
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Pest And Disease Fall Webworm Banner 1440X500
Webs or Bags
Fall Webworm
Fall webworm larvae are pale greenish-yellow with either black or red heads. They have two rows of black spots along their backs and scattered long hairs along their bodies. The caterpillars transform into white moths in the spring.
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Pest And Disease Maple Decline Banner 1440X500
Dieback or Thinning Canopy
Maple Decline
Maple decline is a condition that causes dieback in maple trees.
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AS 507630274 Xyleborus Monographus MOB
Dieback or Thinning Canopy
Mediterranean Oak Borer
This ambrosia beetle infests branches of vulnerable oak trees, invading branches in tree canopies, spreads through the trunk and can ultimately cause death.
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Pest And Disease Center Mole Crickets Banner 1440X500
Brown, Spotted, or Patch Grass on Lawn
Mole Crickets
Mole crickets are pests that tunnel through turf to feed on and ultimately damage roots. Their unique front legs enable them to burrow through lawn soil, creating both a hideaway and feeding spot.
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