Hi Diotima:
A possible reason for mildly aggressive bees is problems with ants. I have a
yard of 15 hives which are all reasonable except one.
Yesterday I went out to put a sticky board in ( it has a screened bottom
board) and found a red ant colony had taken up residence in the bottom
board. They were all over the place and certainly were making the bees
cranky.
Best regards
Donald Aitken
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