Insect & Disease
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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
Cytospora Canker Of Spruce Arborist Advice Banner 002
Mold or Fungus
Cytospora Canker
The plant pathogenic fungus Leucostoma kunzei (formerly Valsa kunzei) is the causal agent of cytospora canker, a disease of some conifers found in the Northern Hemisphere, predominantly on Norway spruce (Picea abies) and Colorado blue spruce (Picea pungens).
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.
Gloomy Scale2
Trunk or Bark Damage
Gloomy Scale
Gloomy scale, is an armored scale insect pest of ornamental trees, most commonly found on the red maple. They are found throughout the Southeastern United States as far north as Maryland, south to Florida and west to Texas.
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.
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.
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.
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.
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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