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 Center Hemlock Woolly Adelgid Banner 1440X500
Mold or Fungus
Hemlock Woolly Adelgid
Hemlock woolly adelgid (HWA) is a serious pest that is related to aphids. Hemlock woolly adelgids injure hemlocks by sucking sap from needles and twigs.
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Pest And Disease Lace Bugs Banner 1440X500
Spotting on Leaf
Lace Bugs
Lace bugs are sap-sucking pests that feed on deciduous and evergreen plants during the spring and summer, weakening their host plants. These pests thrive in full sun under dry conditions. Depending on the species, they are about 1/8-inch long and whitish with tan markings.
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4S0a6655 Peruvian Pepper With Gall Sm
Leaf or Needle Discoloration
Pepper Tree Psyllid
A member of the insect family commonly known as “jumping plant lice,” the pepper tree psyllid sucks sap from trees, leaving a discolored and sparse tree canopy.
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Pest And Disease Thatch Banner 1440X500
Brown, Spotted, or Patch Grass on Lawn
Thatch
Thatch is a dense buildup of grass stems, roots and blades that accumulates between the leaf blade base and the surface of the soil.
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AS 271889195 Thrips
Leaf or Needle Discoloration
Thrips
Thrips are very small yellow-brown or black insects commonly found on flowers in summertime. They feed on a plants’ leaves and flowers by scraping away the epidermal cells and draining the sap.
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Pest And Disease Ash Whiteflies Banner 1440X500
Leaf or Needle Discoloration
Whitefly
Although they look like miniature white moths, whiteflies are neither moths nor flies. Instead, they are insects of varying species in the order of Homoptera, which also includes aphids, scales, and mealybugs.
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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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