Poplar: Satin moth
Photo by: A.L. Antonelli
Biology
The caterpillars of the satin moth feed on leaves of poplars and willows. They may also occasionally attack oak and aspen.
The adult moth is satiny and pure white, with a wingspan of 1 1/2″ to 2″. The caterpillars are voracious feeders, sometimes causing severe defoliation of trees.
Mature caterpillars are approximately 2″ long. They are black, with red and white patches and tufts of hairs along the sides.
Management Options
See "Using Integrated Pest Management (IPM) in the Landscape" for successful problem management techniques.
Non-chemical Management
Select non-chemical management options as your first choice!
- Hand-pick caterpillars when practical. Wear gloves, as hairs may irritate the skin.
- Natural enemies, including a fly and several parasites, help control satin moth populations. Avoid use of broad-spectrum insecticides which may kill beneficial insects.
Chemical Management
IMPORTANT: Always read and follow label directions when working with pesticides.
For more information on using pesticides visit :
- Apply when larvae are seen in late summer.
- If Bt is chosen, be sure to apply when insect is feeding. Best time is when caterpillars are young. Use a spreader-sticker with liquid Bt formulations.
- Homeowners should not make foliar applications to trees over 10 ft tall.
- Consult a commercial pesticide applicator for treatment of trees and shrubs over 10 ft. tall.
Approved Pesticides
If you choose to use a pesticide, some examples of products that are legal in Washington are listed below. Some products are labeled for just INDOOR or just OUTDOOR use, or may allow both uses. Be sure to choose a product appropriate for your situation. Always read and follow all label directions.
WSU Extension programs and employment are available to all without discrimination.
Evidence of noncompliance may be reported through your local Extension office.