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 Twig Girdler And Twig Pruner Banner 1440X500
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.
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Brown Needles On Evergreen (Pine Or Spruce) Tree
Dieback or Thinning Canopy
Winter Desiccation
Winter desiccation is a winter injury condition affecting primarily evergreen shrubs and trees. Winter desiccation occurs most often when soil moisture is low or dry. Heavy winter winds and sun can accelerate water loss and lead to this condition.
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Pest And Disease Center Zimmerman Pine Moth Banner 1440X500
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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Pest And Disease Center Cherry Bark Tortrix Banner 1440X500
Trunk or Bark Damage
Cherry Bark Tortrix
The cherry bark tortrix (CBT) moths are major pests in the Pacific Northwest, where they affect rosaceous trees and shrubs. Affected plants include apple, crabapple, hawthorn, Mountain ash, pear and Photinia species. Prunus species are the preferred hosts.
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Pest And Disease Center Eab Banner 1440X500
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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Pest And Disease Center Needle Blight Banner 1440X500
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.
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Pest And Disease Center Powdery Red Imported Fire Ant Banner1440x500
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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5393150 SMPT Ganoderma Lucidum Lglt
Mold or Fungus
Ganoderma Butt Rot Of Urban Trees
Varnish conk, Ganoderma sessile, is a moderately aggressive species of wood decay fungi that attacks hardwoods and deciduous trees
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