|Females with Egg Masses|
How can I control gypsy moths?
You can help control the Gypsy Moth by looking for signs of infested material in wood piles. If you plan on moving firewood, nursery stock or logs inspect them for signs of the gypsy moth. If you see signs do not move the infested material. If you think you have found the gypsy moth you should:
- Record the location of the tree,
- Record the Signs and Symptoms you observed,
- Collect an adult specimen, keep it in a container in a freezer (to preserve it), and
- Contact the Canadian Food Inspection Agency or call the 1-800-442-2342.
It is important to be thorough when looking for egg masses as they may be difficult to locate. Common hiding places are the underside of branches, tree trunks, fences, firewood, outdoor furniture, swing sets, boats, trailers and under the eaves of buildings. When an egg mass is observed it should be scraped off with a knife and dropped into a bucket filled with hot water and household bleach or ammonia. Larvae and pupae can be handpicked and crushed. Some persons are sensitive to the long hairs of the larvae. As a precaution, gloves should be worn when handling the insect.
Bacillus thuringiensis var. kurstaki (Btk) is a selective biological insecticide which controls lepidopterous larvae (caterpillars). Btk crystals release a toxic protein when dissolved in the alkaline digestive system of the insect. The caterpillar stops feeding soon after, and dies within five days. Other insects, mammals, birds and fish are not affected by Btk.
Where can I find additional information?
Province of Manitoba Forestry Branch: Gypsy Moth Monitoring Results
Canadian Food Inspection Agency (CFIA): Gypsy Moth as Plant Pest
City of Winnipeg Gypsy Moth Control: Gypsy Moth Control in Winnipeg