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 Center Shothole Disease Banner 1440X500
Spotting on Leaf
Shot Hole Disease
Shot hole is a leaf disease that produces brown spots on plant foliage that eventually dry out, fall and leave multiple holes in the leaf.
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Pest And Disease Center Spotted Lanternfly Banner 1440X500
Substance on Leaf or Oozing
Spotted Lanternfly
The spotted lanternfly is an invasive insect species native to Asia. This insect’s eggs are laid in masses about 1” long and may look like patches of crusted mud. Hatched nymphs are black with white dots. Adults are about 1” long with gray forewings that have black spots.
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Pest And Disease Spring Dead Spot In Bermudagrass Banner 1440X500
Brown, Spotted, or Patch Grass on Lawn
Spring Dead Spot In Bermudagrass
Spring Dead Spot (SDS) is a common turf disease that is caused by the fungi Ophiosphaerella herpotricha and O. korrae. The disease creates dead or dying brown patches of turf that vary in diameter depending on the severity of infection.
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Pest And Disease Center Winter Moth Banner 1440X500
Leaf or Needle Discoloration
Winter Moth
The male fringe-winged winter moth is often seen in homes and around lights and holiday decorations in December and January. This invasive pest arrived in the U.S. and Canada from Europe.
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Pest And Disease Botryosphaeria Banner 1440X500
Dieback or Thinning Canopy
Botryosphaeria Canker & Dieback
Botryosphaeria canker is a fungal disease that infects many trees and woody shrubs, especially if they are already stressed or weakened. It causes cankers and dieback.
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Pest And Disease Boxwood Blight Banner 1440X500
Leaf or Needle Discoloration
Boxwood Blight
Boxwood blight is a serious disease caused by a fungal pathogen, Calonectria pseudonaviculata; previously named Cylindrocladium buxicola.
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Pest And Disease White Pine Weevil 1440X500
Holes or Skeletonization in Leaves
California Oakworm
The California oakworm is a caterpillar species that feeds on oak trees throughout California. The larva is about 1-inch long with yellow/green bodies and black stripes down either side and a light orange/brown head. Adult moths are small with tan/gray wings.
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Pest And Disease Canker Banner 1440X500
Trunk or Bark Damage
Fungal Cankers On Trees
Cankers are caused by various species of fungi that infect wounded or stressed trees. The canker itself is the dead area on the bark that can be found on the trunk or branches.
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