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 Powdery Mildew Trees And Shrubs Banner 1440X500
Substance on Leaf or Oozing
Powdery Mildew (Trees & Shrubs)
Powdery mildews, caused by numerous species of fungi, create a white powdery appearance on landscape plants.
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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 Center Gypsy Moth Banner 1440X500
Leaf or Needle Discoloration
Spongy Moth (Formerly Gypsy Moth)
Spongy moths are insects who can cause extreme defoliation to trees when in their caterpillar stage.
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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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Ganoderma Applanatum Redwood CA Dmiller 3
Mold or Fungus
Artist’s Conk
Artist’s conk, is a fungal species that causes decay in trees. This fungal species is aggressive and causes a white rot within its tree host.
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Pest And Disease Borers Banner 1440X500
Trunk or Bark Damage
Tree Borers
Borers are chewing insects, usually in larval stages, that chew and feed on the inner bark and/or wood of trees. Most species are the larvae of beetles.
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