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 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 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 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 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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