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 Resource Center Ambrosia Beetle Banner 1440X500
Sawdust on Trunk
Granulate Asian Ambrosia Beetle
The Granulate ambrosia beetle, or Asian ambrosia beetle, is a small, dark reddish-brown insect that is native to Asia.It has become established in more than 25 states in the United States.
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Pest And Disease Iron Deficiency Chlorosis In Turfgrass Banner 1440X500
Brown, Spotted, or Patch Grass on Lawn
Iron Deficiency Chlorosis In Turfgrass
Iron deficiency chlorosis (IDC) is a condition caused by lack of iron. The disorder can be found in various species of turfgrass, but commonly in St. Augustinegrass. Yellow, blotchy patches form in a lawn after blades turn pale green and eventually bright yellow.
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