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 Horned And Gouty Oak Galls Banner 1440X500
Growth on Foliage or Branch
Horned & Gouty Oak Galls
There are various species of wasps that may infest oak trees, but two common species include the horned oak gall wasp (Callirhytis cornigera) and the gouty oak gall wasp (Callirhytis quercuspunctata). These pests cause galls, or abnormal plant growths, found on foliage and twigs.
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Fotolia 85089638 IPS Beetle M
Leaf or Needle Discoloration
Ips Pine Bark Beetles
All stressed pine and spruce trees are vulnerable attack. Healthy trees are rarely attacked, although where Ips populations are extremely high, healthy trees may be overwhelmed by large numbers of beetles.
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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.
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Ss 456412858 Chlorosis On Cherry Tree
Wilted or Curled Leaves
Pest Management | Stress Reduction
There are many abiotic and biotic stressors that can negatively impact tree health. Common stressors can include: air pollution, drought, flooding, improper planting and mechanical injury.
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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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Pest And Disease Pine Tip And Pine Shoot Moth Banner 1440X500
Webs or Bags
Pine Tip & Pine Shoot Moths
Pine tip and pine shoot moths are the caterpillars of moths that attack conifer trees, causing a drought-like appearance to the tree.
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Pest And Disease Center Rust Disease Banner1440x500
Brown, Spotted, or Patch Grass on Lawn
Rust Disease
Rust disease first appears as small, yellowish-orange to reddish-brown flecks on grass blades and eventually grows into raised pustules on blades and stems.
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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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