Michigan 2023 spongy moth forecast


Are they out of the woods yet? The 2023 spongy moth forecast
Despite the recent cold weather, spongy moth caterpillars already may be hatching in the Lower Peninsula, according to Michigan State University’s Enviroweather prediction model.
The good news is that areas hardest hit by the nuisance caterpillars in the last few years should see a significant population decrease this year.
According to James Wieferich, forest health unit manager with the Michigan Department of Natural Resources, the outbreak cycle for most of the state peaked in 2021 and will continue to decline overall.
“Aerial and forest surveys mapped over 1.35 million acres of defoliated trees in 2021, compared to 386,000 acres in 2022,” said Wieferich. “This substantial population collapse is a result of the naturally occurring nuclear polyhedrosis virus, or NPV, and the Entomophaga fungus that affect spongy moth caterpillars.” Read more