It’s killing the trees!!!
Location: Avon, CT, USA
September 10, 2011 4:43 pm
Just wondering what kind of insect this is. I tried other bug identification sites and came up with nothing. Any help would be great. Thanks.
We have recently learned that Giant Ichneumons in the genus Megarhyssa, like the one in your photo, are commonly called Stump Stabbers because of the long ovipositor that the female inserts in stumps and dying trees. This Giant Ichneumon is not killing your trees. The health of the trees were most likely already compromised when the trees became infested with the larvae of a wood boring wasp called the Pigeon Horntail, our Bug of the Month for September. The Stump Stabbers are parasitic insects whose larvae prey upon the wood boring larvae of the Pigeon Horntails. We believe your Stump Stabber is Megarhyssa macrurus.