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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Trunk or Bark Damage

Emerald Ash Borer

Emerald ash borer (EAB) is an Asian beetle that threatens the existence of ash trees throughout North America. These insect pests have killed millions of ash trees in urban areas, woodlots, and nurseries, spreading via infested nursery stock and firewood.

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Leaf or Needle Discoloration

Needle Blight & Cast Of Pines

Brown spot needle blight, Cyclaneusma needle cast, Dothistroma needle blight, and Lophodermium needle cast are common fungal diseases that attack pine needles, causing spots, blights, and premature defoliation.

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.

Red Imported Fire Ant

The red imported fire ant is an invasive species that inhabits lawns, pastures, fields and roadsides to create lumpy soil mounds. They are known to sting people and animals which can be quite painful.

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Dieback or Thinning Canopy

Twig Girdler & Twig Pruner

Twig girdlers and twig pruners are beetles that attack the twigs of trees. They lay eggs at the ends of branches and cut off the tips of the branch, allowing the larvae to feed on and pupate inside the twigs.

Webs or Bags

Zimmerman Pine Moth

Zimmerman pine moths are 5/8” long with gray wings marked with mottled red and gray. Once a year, their larvae hatch and tunnel into trees, interfering with the tree’s sap flow and weakening them. Eventually, wind may break the weakened tops.

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Spotting on Leaf

Algal Leaf Spot Of Magnolia

Raised, wavy, cushion-like spots are symptoms of algal leaf spot, also known as green scurf. The spots are greenish, pinkish or grayish and less than 1 cm. in diameter. They may encircle a twig, creating a girdling canker.

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Substance on Leaf or Oozing

Bacterial Wetwood & Slime Flux

Bacterial wetwood is a bacterial infection that causes a profuse flow (flux) of sap from trunk wounds or pruning cuts.

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