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 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.
Pest And Disease Ash Whiteflies Banner 1440X500
Leaf or Needle Dropping
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.
Pest And Disease Bacterial Leaf Scorch Banner 1440X500
Leaf or Needle Dropping
Bacterial Leaf Scorch
Bacterial leaf scorch, also known as Marginal leaf burn, is a chronic and systemic disease mostly affecting oaks and maples.
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.
Pest And Disease Bagworms Banner 1440X500
Leaf or Needle Dropping
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.
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.
Pest And Disease Beech Leaf Disease Banner 1440X500
Wilted or Curled Leaves
Beech Leaf Disease
Beech leaf disease (BLD) is a disease that is contributing to a localized yet significant decline of beech trees.
Pest And Disease Birch Leafminer Banner 1440X500
Leaf or Needle Discoloration
Birch Leafminer
Birch leaves develop brown, inflated blotches by mid to late spring. Leaves may be killed by small larvae inside the leaves that devour green tissues between the upper and lower surfaces.
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