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 Aphids Banner 1440X500
Mold or Fungus
Aphids, sometimes called plant lice, are soft-bodied, sucking insects. They tend to cluster in large colonies on new growth and come in a variety of species that may be green, black, red, orange, wooly, spotted or bow-legged.
Pest And Disease Boxwood Decline Banner 1440X500
Spotting on Leaf
Boxwood Leafminer
Boxwood Leafminer are small flies that attack several varieties of boxwood, causing the usually dense foliage to appear weak and lackluster. These pests can kill boxwood twigs and cause mature plants to become susceptible to other diseases, including winter-kill in colder climates.
Pest And Disease Chinch Bugs Banner 1440X500
Leaf or Needle Discoloration
Chinch Bugs
Chinch bugs are small black and white insects that live in thatch and damage turf by sucking the sap and injecting toxic saliva. Adults are about 1/5 long. Newly hatched, immature nymphs appear bright red with a white band across the back.
Pest And Disease Center Eastern Tent Caterpillar Banner 1440X500
Webs or Bags
Eastern Tent Caterpillar
The eastern tent caterpillar is a pest native to the United States whose presence was first recorded in the mid-1600s. Found in the eastern and central United States, it has been seen as far west as the Rocky Mountains. It appears in large numbers, generally every ten or so years.
Pest And Disease Mites Banner 1440X500
Leaf or Needle Discoloration
Mites are nearly invisible, but they can cause destruction that will surely be noticed on a variety of indoor and outdoor trees, shrubs and plants. Signs that mites are present include spotting, bronzing or yellowing of leaves and the presence of small webs between twigs.
Pest And Disease Wood Decay Fungi Banner 1440X500
Mold or Fungus
Wood Decay Fungi In The Landscape
Certain fungi attack multiple species of trees. Mushroom growths, called conks, are seen on the lower portion of the trunk and vary in shape, size and color.
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 Black Vine Weevil Banner 1440X500
Holes or Skeletonization in Leaves
Black Vine Weevil
The black vine weevil is a destructive insect that kills host plants by feeding on their foliage. Larvae are white, C-shaped grubs that feed on plant roots and bark cambium, resulting in yellowing and wilting of foliage, and plant death.
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