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Gypsy moths complete one generation each year.
Eggs hatch in spring, typically between early and mid-May in much of lower Michigan, and in late May or mid-June farther north.
You can decrease spring caterpillar hatch without using chemicals by finding and eliminating the egg masses from which caterpillars hatch. Depending on the location, egg laying is complete by mid-September.
If the county you live in does not have a control program, consider removing egg masses as you see them from September to April, before hatch occurs.
Visit alpenamontcd.org for more information on eliminating those nasty egg masses and to download an electronic Gypsy Moth Reporting Form.
Egg masses are laid near the spot where the female pupated, and are usually found on tree trunks or branches. They can also be laid on other outdoor items, such as firewood, picnic tables, lawn furniture, wheel wells, and under the bumper of vehicles.
The gypsy moth is in the egg mass for nearly nine months, giving ample time to find and eliminate them.
If you did not find any egg masses in the fall, keep an eye out in early spring. Inspect your trees and shrubs for the various stages of the gypsy moth. May is a good time to watch for the caterpillars, since that is when they begin to hatch.
If you see instars, take quick action. Some folks use Bt (Bacillus thuringiensis) to protect their trees from severe defoliation. Bt is sprayed on host tree leaves one to two weeks after eggs have hatched. Young caterpillars are vulnerable to Bt. They must consume leaves that have been recently sprayed for the Bt to be effective. Bt is not as effective on larger caterpillars.
Burlap barrier bands, sticky bands, and yes, our old stand by duct tape, can also be effective on an individual tree.