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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Damage & Symptoms
Pest And Disease Oak Galls Banner 1440X500
Growth on Foliage or Branch
Oak Galls
Oak galls are abnormal plant growths found on foliage and twigs that are produced by small oak gall wasps. Shapes of galls vary from spherical to urn-shaped to star-shaped to fuzzy. Inside the galls are the eggs and larvae of the insects.
Pest And Disease Oak Mazegill Banner 1440X500
Mold or Fungus
Oak Mazegill Mushroom
Oak mazegill is a mushroom that grows in heartwood or already rotting wood. These types of stemless mushrooms are called conks.
Pest And Disease Center Oak Wilt Banner 1440X500
Mold or Fungus
Oak Wilt Disease
Oak wilt is a vascular disease caused by a fungus that spreads locally from infected trees to nearby healthy trees. Primarily transmitted through root grafts, it causes sudden wilting, early leaf drop, discolored leaves, and sometimes, vascular streaking in the sapwood.
Pest And Disease Center Oleander Caterpillar Banner 1440X500
Holes or Skeletonization in Leaves
Oleander Caterpillar
The oleander caterpillar is a bright orange, black-spotted pest that feeds on and skeletonizes leaves of the oleander plant.
Pest And Disease Oyster Mushroom Banner 1440X500
Mold or Fungus
Oyster Mushrooms
Oyster mushrooms are very common fungi that are found all over the world. They grow in a flat, broad fan shape and range in colors from white, gray, tan and dark brown. The surface is smooth and the underside shows layers of gills.
Pest And Disease Center Peach Leaf Curl Banner 1440X500
Bumps or Blisters on Leaf or Needle
Peach Leaf Curl
Peach leaf curl is a disease that primarily targets peach trees just before or after bud break in the spring. Infected tree leaves will turn red, form blisters and wilt.
4S0a6655 Peruvian Pepper With Gall Sm
Leaf or Needle Discoloration
Pepper Tree Psyllid
A member of the insect family commonly known as “jumping plant lice,” the pepper tree psyllid sucks sap from trees, leaving a discolored and sparse tree canopy.
Pest And Disease Center Photinia Leaf Spot Banner 1440X500
Mold or Fungus
Photinia Leaf Spot
Photinia leaf spot is a fungus that discolors and destroys plant leaves in the cool, wet elements of spring and fall.
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