Gypsy Moth Spraying Program

Many Michigan residents have heard of the gypsy moth, though they many not know what the insect looks like. Gypsy moth is a notorious pest that feeds on the leaves of oaks, aspen and many other species of shade and forest trees.

Gypsy Moth Spraying Program Map

By the first week of June, the Gypsy Moth Spraying Program will be underway in targeted areas throughout the township (see accompanying map). The Township will have 452 acres of property sprayed this year. This is a slight increase in the number of acres being sprayed when compared to last year.

Our consultant has indicated that the gypsy moth population is up only slightly from last season. The population centers that were found are very healthy with little parasitism and good viability. This strongly suggests that the population is attempting to recover its numbers and the natural suppression processes are not keeping up.

The program area will be sprayed with a non-toxic biological agent called Bacillus thuringiensis or "Bt". Here are some of the most common questions about gypsy moths.

What does "Bt" do to gypsy moths?
Gypsy moth larvae pass through different life stages: egg, caterpillar, cocoon and adult. Trees are endangered by the gypsy moth at the caterpillar stage only. When the caterpillar eats leaves sprayed with "Bt", it releases a protein that damages their stomachs. The caterpillars become sick and stop eating. During the next two or three days, bacteria enters the caterpillar's blood, eventually killing them.

Is "Bt" dangerous to people, pets and livestock, or other beneficial insects?
One of the benefits of "Bt" is that only young caterpillars are affected. "Bt" is harmless to people, even at high dosages. "Bt" does not harm other mammals, birds or fish. Most beneficial insects, including honeybees and ladybugs, are not affected.

What does a gypsy moth caterpillar look like?
The mature caterpillar reaches a length of approximately two inches. The caterpillar can be identified by the distinctive color pattern on its back. It will have a series of blue colored spots that are grouped in pairs, followed by a series of red spots grouped end to end. The head is beige with dark marks. It has no silk tents. They are usually attached to the bark of the tree trunk.

Remember, the gypsy moth does its damage during the caterpillar stage, which is during mid-May to mid-June. If your trees are being defoliated later in the summer, it's caused by something other than gypsy moths.

The spraying will be conducted over a two-day period. Residents in spray areas need not remain indoors while spraying is underway and can safely go about their regular daily activities. As "B.t." is released into the air, it will descend upon trees and grounds in a light mist which will be barely discernible. Residents can expect to find dead caterpillar larvae in and around their yards upon completion of the insecticide application.

To learn more about the Gypsy Moth click here.

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