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

Trunk or Bark Damage

Gloomy Scale

Gloomy scale, is an armored scale insect pest of ornamental trees, most commonly found on the red maple. They are found throughout the Southeastern United States as far north as Maryland, south to Florida and west to Texas.

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.

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.

Brown, Spotted, or Patch Grass on Lawn

Turf Grubs

Grubs are larvae of insects such as Japanese beetles, June beetles and other species that feed on grass roots in soil.

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.

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.

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.

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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