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 Sudden Oak Death Banner 1440X500
Dieback or Thinning Canopy
Sudden Oak Death
Sudden Oak Death (SOD) is caused by a water mold called Phytophthora ramorum. The disease is common throughout California and Oregon.
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Ganoderma Applanatum Redwood CA Dmiller 3
Mold or Fungus
Artist’s Conk
Artist’s conk, is a fungal species that causes decay in trees. This fungal species is aggressive and causes a white rot within its tree host.
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Pest And Disease Borers Banner 1440X500
Trunk or Bark Damage
Tree Borers
Borers are chewing insects, usually in larval stages, that chew and feed on the inner bark and/or wood of trees. Most species are the larvae of beetles.
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Pest And Disease Maple Decline Banner 1440X500
Dieback or Thinning Canopy
Maple Decline
Maple decline is a condition that causes dieback in maple trees.
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Pest And Disease Center Mole Crickets Banner 1440X500
Brown, Spotted, or Patch Grass on Lawn
Mole Crickets
Mole crickets are pests that tunnel through turf to feed on and ultimately damage roots. Their unique front legs enable them to burrow through lawn soil, creating both a hideaway and feeding spot.
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Pest And Disease Oak Bracket Banner 1440X500
Mold or Fungus
Oak Bracket Fungus
Oak bracket is a fibrous, “weeping” fungus that grows at the base of oak trees. The thick fruiting body is called a conk and varies from 2-12cm in width. The surface is a creamy brown color with pitted tubes that secrete an orange/amber liquid when young.
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Pest And Disease Phytophthora Diseases Banner 1440X500
Leaf or Needle Discoloration
Phytophthora Diseases
Phytophthora is a genus containing many species of fungal-like organisms that cause blights, wilts, cankers, root rots and dieback on many plant species around the world.
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Pest And Disease Crabgrass Banner 1440X500
Brown, Spotted, or Patch Grass on Lawn
Crabgrass
There are several species of crabgrass. Common crabgrass is one of the most undesirable and dominant weeds in home lawns. A lighter shade of green than typical turfgrasses, it has a coarse texture and clumpy appearance.
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