Invasive to Watch: Gypsy moth

Gypsy moth caterpillar
Gypsy moth caterpillar

What is gypsy moth? Gypsy moth caterpillars feed on the leaves of over 500 species of trees. This invasive has infested the eastern half of Wisconsin and efforts are underway to slow the westward spread.

Why is it a problem? Populations of gypsy moth caterpillars reach outbreak levels every 10 years, during which entire forests can be defoliated. This defoliation threatens tree health by causing stress, making them more susceptible to damage by other pests, diseases and extreme weather conditions.

What can I do? Use the 25-mile rule! Wood coming or leaving your property should stay within a 25 mile radius. Also, learn how to identify gypsy moth from other caterpillars.

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