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
Pest And Disease Pythium Blight Banner 1440X500
Brown, Spotted, or Patch Grass on Lawn
Pythium Blight
Pythium blight is a destructive lawn disease that causes small, light brown, matted spots on grass.
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Pest And Disease Rhizosphaera Needlecast Banner 1440X500
Leaf or Needle Discoloration
Rhizosphaera Needle Cast
Rhizosphaera is a fungal genus that affects cone-bearing shrubs and trees throughout the Northern hemisphere.
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Pest And Disease Southern Pine Beetle Banner 1440X500
Sawdust on Trunk
Southern Pine Beetle
Southern pine beetle (SPB) is a 1/8 inch to 1/4 inch wood-boring insect that infests pine trees, killing even large trees very quickly. It is one of the most destructive pests in the Southern and Southeastern United States.
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Pest And Disease Center Vascular Wilt Disease Banner 1440X500
Mold or Fungus
Vascular Wilt Diseases
Vascular wilt diseases are caused by different fungi that attack the vascular (water-conducting) system of trees. A tree responds by blocking its vascular system to contain the disease. In doing so, the water supply to the leaves is cut off.
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Pest And Disease Ash Rust Banner 1440X500
Spotting on Leaf
Ash Leaf Rust
Ash leaf rust can be a significant problem in the Mid-Atlantic area and along the New England coast. Leaves, petioles and green twigs become infected during May and June. When the infection is severe, premature defoliation can occur.
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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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