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You may try a roober screen that force the HBs to enter from above the main hive entrance.
Make a wooden frame from 3/4"x3/4" stock. Frame as wide as the hive body and about 4 inches tall. Cover with #8 hardware cloth. Cut HB entrance notch in upper 3/4x3/4 cross member. Attach with bottem of frame flush with landing board. Hopefully the wasp will not find the new entrance.
I call them European hornets. A couple of years ago I had a bad problem with them but luckily found the tree where they were nesting. I cut the tree and burned them out - after spray and gasoline alone failed to kill them. Fire worked.
Make a wooden frame from 3/4"x3/4" stock. Frame as wide as the hive body and about 4 inches tall. Cover with #8 hardware cloth. Cut HB entrance notch in upper 3/4x3/4 cross member. Attach with bottem of frame flush with landing board. Hopefully the wasp will not find the new entrance.
I call them European hornets. A couple of years ago I had a bad problem with them but luckily found the tree where they were nesting. I cut the tree and burned them out - after spray and gasoline alone failed to kill them. Fire worked.
