The Wisconsin Department of Natural Resources (DNR) today announces aerial spraying operations will soon take place over four DNR properties to combat spongy moth caterpillars, formerly known as gypsy moth.

Spongy moth caterpillars strip trees of their leaves, potentially killing high-value trees. Spongy moth outbreaks occur every five to 10 years, and this year’s high populations threaten tree defoliation in high-use areas of some state properties.

The aerial spraying will take place in late May to early June, with the exact date and times depending on weather conditions and caterpillar development. The DNR plans to avoid spraying during the extended Memorial Day weekend if spraying has not taken place before then.

For more information, visit the DNR website: https://dnr.wisconsin.gov/newsroom/release/75861