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Maine outlines targeted releases of parasitoid wasps to help control emerald ash borer
Summary
State entomologists described a biological control program that has released three tiny parasitoid wasp species since 2019; releases require APHIS sign‑off and suitable sites (roughly 40 acres with ~25% ash or connected stands).
Colleen Tierling, an entomologist with the Maine Forest Service, described the state’s biological control program aimed at reducing emerald ash borer (EAB) population pressure over time. "We have 3 tiny little parasitoids. They're wasps," she said, explaining that the agents are highly specific to EAB and were tested extensively before release.
Tierling said the program began releasing…
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