Insect & Disease Resource Center
Browse More Pests and Diseases
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Ash Flower Gall
Ash flower gall is a symptom of feeding activity of microscopic mites known as ash flower gall mites.
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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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Ash Whitefly
Ash Whitefly is a native European and North African pest that has been harming ash, citrus and other fruit trees throughout North America (in areas such as Southern California and Florida) since the late 1980s.
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Bacterial Leaf Scorch
Bacterial leaf scorch, also known as Marginal leaf burn, is a chronic and systemic disease mostly affecting oaks and maples.
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Bacterial Wetwood and 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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Bagworms
Bagworms are destructive pests of shrubs and woody ornamentals that are native to North America. Their spindle-shaped protective bags made from silk, debris and foliage provide camouflage, so they go unnoticed until there is significant plant damage.
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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.