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 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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Shutterstock 1541742800 Conifer Needles Brn
Leaf or Needle Dropping
Seasonal Needle Drop Of Conifers
Coniferous trees often lose their aging needles on a 2-3 years natural life cycle. Aging needles turn yellow, then brown and drop.
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Pest And Disease Turf Grubs Banner 1440X500
Brown, Spotted, or Patch Grass on Lawn
Turf Grubs
Grubs are larvae of insects such as Japanese beetles, June beetles and other species that feed on grass roots in soil.
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Pest And Disease Ash Whiteflies Banner 1440X500
Leaf or Needle Dropping
Ash Whitefly
Ash Whitefly is a native European and North African pest that has been harming ash, citrus and other fruit trees throughout North America (in areas such as Southern California and Florida) since the late 1980s.
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Pest And Disease Beech Leaf Disease Banner 1440X500
Wilted or Curled Leaves
Beech Leaf Disease
Beech leaf disease (BLD) is a disease that is contributing to a localized yet significant decline of beech trees.
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