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

Red Imported Fire Ant

The red imported fire ant is an invasive species that inhabits lawns, pastures, fields and roadsides to create lumpy soil mounds. They are known to sting people and animals which can be quite painful.

Pest And Disease Twig Girdler And Twig Pruner Banner 1440X500

Dieback or Thinning Canopy

Twig Girdler & Twig Pruner

Twig girdlers and twig pruners are beetles that attack the twigs of trees. They lay eggs at the ends of branches and cut off the tips of the branch, allowing the larvae to feed on and pupate inside the twigs.

Webs or Bags

Zimmerman Pine Moth

Zimmerman pine moths are 5/8” long with gray wings marked with mottled red and gray. Once a year, their larvae hatch and tunnel into trees, interfering with the tree’s sap flow and weakening them. Eventually, wind may break the weakened tops.

Mold or Fungus

Ganoderma Butt Rot Of Urban Trees

Varnish conk, Ganoderma sessile, is a moderately aggressive species of wood decay fungi that attacks hardwoods and deciduous trees

Brown Needles On Evergreen (Pine Or Spruce) Tree

Dieback or Thinning Canopy

Winter Desiccation

Winter desiccation is a winter injury condition affecting primarily evergreen shrubs and trees. Winter desiccation occurs most often when soil moisture is low or dry. Heavy winter winds and sun can accelerate water loss and lead to this condition.

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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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