More than 13,000 foreign killers were turned loose in Connecticut this summer, an airborne army of assassins unleashed to take down a very special enemy.
The killers are known as "parasitoid" wasps. Their only target is the emerald ash borer, an insidious alien invader that could end up destroying large sections of Connecticut forest if left unchecked.
Whether these tiny "biocontrol" warriors will succeed is anybody's guess.
"These wasps are kind of the best hope we have, but it's hard to predict the long term," says Claire E. Rutledge, a scientist at the Connecticut Agricultural Experiment Station.
Rutledge was in charge of...