Poplar: Satin moth
categories: Ornamental trees Ornamentals Poplar Poplar Insects
last review date: 2025-06-28 09:27
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: Visit Home and Garden Fact Sheets for more information on using pesticides.
- 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
Examples of pesticides that are legal for home use in Washington State are listed below.
The list may not include all products registered for this use.
WSU Extension programs and employment are available to all without discrimination.
Evidence of noncompliance may be reported through your local Extension office.