Insect & Disease
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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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Mold or Fungus

Aphids

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.

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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.

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.

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.

Leaf or Needle Discoloration

Mites

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.

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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.

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.

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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