US releases parasitic wasps to fight tree-killing beetle
from BBC News
Millions of tiny, parasitic wasps have been deployed across 24 U.S. states in an effort to stop the spread of the tree-killing emerald ash borer. The beetle has killed about 38 million ash trees, according to the US Department of Agriculture. The USDA approved the release of four species of wasps, which lay eggs inside the ash borer larvae and prevent them from developing into adult beetles.
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