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 Barklice Banner 1440X500
Webs or Bags
Bark Lice
Bark Lice are small, dark-colored insects that produce fine, dense webbing on the trunks of host trees. Varying in color from tan to black, these pests may or may not have wings, and are usually less than five millimeters long.
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Pest And Disease Boxwood Decline Banner 1440X500
Leaf or Needle Discoloration
Boxwood Decline
Boxwood decline is a condition that causes weak growth, discoloring of leaves and branch dieback in boxwood shrubs. This condition usually involves several factors, including poor planting conditions and improper cultural practices, as well as stem and root diseases.
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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).
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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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