Hurricane Ian Response: Please be advised that we are prepared to respond to post-storm requests as soon as it is safe to do so. 

Western Tussock Moth Description:

The western tussock moth is considered a pest and commonly found on the Pacific coast from southern California up to British Columbia.

Hosts:

This pest feeds on willow, hawthorn, manzanita, oak, walnut, crabapple, pyracantha, California holly, coffeeberry, and other plants.

Biology & Symptoms:

In southern California, two generations may occur each year. Other areas may have only one generation per year. In northern California, this insect lays eggs in summer in felt-like masses, usually on old cocoons. These grayish-brown masses are typically 1/4” to 3/8” in diameter. The eggs hatch early the following spring. The larvae (caterpillars) are attractively colored, with spots of red and yellow, and four rounded, brush-like tufts on their backs. The young larvae skeletonize the leaves, while more mature larvae eat entire leaves. They remain caterpillars for 40 to 60 days and can become a nuisance when they wander to find a place to pupate. The adults emerge the same year as the cocoons are formed (pupation). The adult females are wingless and silvery-gray, while the males have wings and are grayer in color.

Management:

If necessary, pesticide applications during the early stages of larval feeding may help control the pest. Ask an arborist about the best treatment options for your property.

See More Articles

Pest And Disease Bagworms Banner 1440X500
Leaf or Needle Dropping

Bagworms

Bagworms are destructive pests of shrubs and woody ornamentals that are native to North America. Their spindle-shaped protective bags made from silk, debris and foliage provide camouflage, so they go unnoticed until there is significant plant damage.
Read More
Pest And Disease Center Barklice Banner 1440X500
Webs or Bags

Bark Lice

Bark Lice are small, dark-colored insects that produce fine, dense webbing on the trunks of host trees. Varying in color from tan to black, these pests may or may not have wings, and are usually less than five millimeters long.
Read More

Get In Touch With Us!

We pride ourselves at Davey Tree on providing prompt, professional and personalized service from certified arborists that live, work and engage in your community. Contact one of our Davey Tree specialists for your residential needs.

Let's Find What
You're Looking For!

Davey uses cookies to make your experience a great one by providing us analytics so we can offer you the most relevant content. By continuing to use this site, you accept our use of cookies. View our Privacy Policy for more information.