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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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Damage & Symptoms
AS 507630274 Xyleborus Monographus MOB
Dieback or Thinning Canopy
Mediterranean Oak Borer
This ambrosia beetle infests branches of vulnerable oak trees, invading branches in tree canopies, spreads through the trunk and can ultimately cause death.
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Shutterstock 1541742800 Conifer Needles Brn
Leaf or Needle Dropping
Seasonal Needle Drop Of Conifers
Coniferous trees often lose their aging needles on a 2-3 years natural life cycle. Aging needles turn yellow, then brown and drop.
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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 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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Pest And Disease Dollar Spot Banner 1440X500
Brown, Spotted, or Patch Grass on Lawn
Dollar Spot Fungus
Dollar spot is caused by a fungus that causes blight to grass blades, but does not harm roots or crowns. Infections start as small circular areas about the size of a silver dollar, hence the name.
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Pest And Disease Eastern Spruce Gall Adelgid Banner 1440X500
Growth on Foliage or Branch
Eastern Spruce Gall Adelgid
The Eastern spruce gall adelgid, Adelges abietis, is a soft-bodied, aphid-like insect that sucks plant juices. As immature adelgids feed, they form cone-shaped galls containing more adelgids. These galls can cause disfigurement and weaken trees, which may lead to their decline or death.
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Pest And Disease Elongate Hemlock Scale Banner 1440X500
Leaf or Needle Discoloration
Elongate Hemlock Scale
Elongate hemlock scale is an armored scale pest with a hard, waxy coating. Small, oblong, flattened insects appear on lower needle surfaces.
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