Subject: I’m resending bald-face hornet girdling gridwork on bark.
Geographic location of the bug: Tonasket WA
Time: 08:11 PM EDT
Your letter to the bugman: I sent this about a week ago and got the confirmation e-mail and I realize you can’t post everything. I did kinda wonder if the picture came thru as I’m on Windows 7 and I’ve had problems with the upload before. So, just checking. I was told BF hornets did it. I thought, Makes sense, thy use the bark to make their paper nests. Then I looked it up! I read they do it to make the sap run and then they eat it! They are “vegan?” and only gather insects and B-B-Q (haha) to provision their babies. Apparently they can girdle a tree, but this pattern leaves bark and cambium to continue the sap flow. Can you verify this behavior? Or if something else did, do you know who? I don’t think it’s our red-naped sapsucker, they leave a grid work of little round drilled holes, and they’re the only sapsuckers we have. Thanks.
How you want your letter signed: Cathy
We cannot confirm that Hornets damaged this tree, but if your theory is correct, they should revisit the site to feed. We have images on our site of European Hornets (introduced to eastern North America) stripping the bark off of lilac bushes. We will attempt further research into this matter.