Hornets eating bath on Ash trees

Asked September 21, 2017, 10:22 AM EDT

I have large hornets eating the bark off my 3 Ash trees this year. Only on the branches, not the trunk. No nests. Never seen this before. They aren't phased by hornet spray. What should I do? I'm in zip code 21087. Sorry the pictures are fuzzy. Thanks

Baltimore County Maryland

1 Response

There are no products registered to prevent European hornets from girdling the twigs or bark. They are looking to feed on the sap. All you can do is prune dead or damaged wood.
It can be difficult to find their nests. See our website for more information http://extension.umd.edu/hgic/european-hornets

Monitor your trees for signs of the emerald ash borer, an invasive pest in Maryland. See our website for more information http://extension.umd.edu/hgic/invasives/emerald-ash-borer
If you have trees in good health consider protection. Dead trees become hazardous and ash trees become brittle when they die. In some instances cranes may be needed for removal.