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 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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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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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 Algal Leaf Spot Banner 1440X500
Spotting on Leaf
Algal Leaf Spot Of Magnolia
Raised, wavy, cushion-like spots are symptoms of algal leaf spot, also known as green scurf. The spots are greenish, pinkish or grayish and less than 1 cm. in diameter. They may encircle a twig, creating a girdling canker.
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Pest And Disease Slime Flux Banner 1440X500
Substance on Leaf or Oozing
Bacterial Wetwood & Slime Flux
Bacterial wetwood is a bacterial infection that causes a profuse flow (flux) of sap from trunk wounds or pruning cuts.
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