What's That Bug? does not endorse extermination

strange insect in my garden
My sons were in the garden and noticed this "yellow headed monster" – it seemed to have a long proboscis inserted into the base of our maple tree, and its abdomen slowly started turning from black to white, as if it were emptying itself into the tree. I used a stick and "encouraged" it to remove this from the tree, and the abdomen went back to black. There were actually three long black probosces coming from the end of the abdomen. Any ideas? Thank you very much. p.s. Is there anything I can or should do about this? a friend suggested injecting vinegar into the site where the eggs were likely laid. Would this work? Thank you.
Tara

Hi Tara,
We love your letter on so many levels, but especially for the interesting way you described the oviposition of a female Giant Ichneumon, Megarhyssa atrata. This is actually a beneficial insect. She is laying eggs in wood that has wood boring grubs. Her larva will consume the grubs and not harm your trees. She has an ovipositor, not a proboscis. We are also intrigued with the vinegar suggestion. Not sure, but is sounds as if vinegar might be effective in controlling some insect pests.

What's That Bug? does not endorse extermination

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