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Asian hornets in North America

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Ugh…just finished this very article…as if honeybees don’t have enough pressure already :woman_facepalming:

Anyone know the size of holes necessary to keep hornets out? All the size info I’ve seen on these things is just how long they are, not how small a hole they can climb through. I’m in Northern CA and already thinking about what kinds of grids I could put over my hive’s entrances if the hornets are spotted in my area.

There’s a photo in the article Alan posted showing one (a dead one) on the front of a man’s beeksuit, that should give a decent-enough proportion context. But, for your purpose, anything with bee-sized holes and no other openings would serve I guess.