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

Mold or Fungus

Monilinia Brown Rot

Brown rot is a common fungal disease that attacks trees with stone fruits. It infects flowers, fruits and branches, sometimes destroying entire crops.

Pest And Disease Oyster Mushroom Banner 1440X500

Mold or Fungus

Oyster Mushrooms

Oyster mushrooms are very common fungi that are found all over the world. They grow in a flat, broad fan shape and range in colors from white, gray, tan and dark brown. The surface is smooth and the underside shows layers of gills.

Pest And Disease Pine Wilt Banner 1440X500

Leaf or Needle Discoloration

Pine Wilt Disease

Pine wilt disease is caused by tiny worms called pine wood nematodes and beetles called sawyers that work together resulting in a disease that rapidly discolors and kills pine trees.

Mold or Fungus

Pink Snow Mold

Pink snow mold is a fungal disease that creates patches of dense, whitish-pink grass blades in winter and spring.

Pest And Disease Red Thread And Pink Patch Banner 1440X500

Brown, Spotted, or Patch Grass on Lawn

Red Thread & Pink Patch

Red thread and pink patch are closely related fungal pathogens that infect turf, appearing with a reddish-brown covering and wilted patches.

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.

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.

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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