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
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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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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Pest And Disease Turf Grubs Banner 1440X500
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.
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Pest And Disease Cankerworm Banner 1440X500
Holes or Skeletonization in Leaves
Cankerworms
Cankerworms are caterpillars of several North American moths that have wingless females. Cankerworms feed on the buds and leaves of trees in early spring and can be a major pest.
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Pest And Disease Center Cedar Rust Banner 1440X500
Mold or Fungus
Cedar Rust
There are multiple rust fungi that affect cedars (junipers): cedar-quince rust, cedar-hawthorn rust and cedar-apple rust. All of these rusts require two different hosts and alternate between them during the year. Cedar-quince rust appears as elongated branch swellings that produce orange spores.
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Pest And Disease Center Cottony Maple Scale Banner 1440X500
Mold or Fungus
Cottony Maple Scale
The cottony maple scale is a large, flat, brown scale insect found on the twigs and branches of various trees. White, cottony egg masses that resemble popcorn are its most distinguishing feature.
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Pest And Disease Center Diplodia Tip Blight Banner 1440X500
Leaf or Needle Discoloration
Diplodia Tip Blight
Diplodia tip blight of pines (formerly known as Sphaeropsis tip blight) is caused by the fungus Diplodia pinea. The fungus can live in dead needles, branches, and cones of the tree all year round.
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