I have three hives, at least one of which houses a somewhat aggressive colony. (I have been stung, on more than one occassion, without provocation while in my garden 10-12 feet from the hives. And no, I had not been eating bananas!) I want to know from which colony the culprit came.
I've read about using blue suede as a way to test the bees; first reported, I believe, by Stort in 1974.
I just tried using both a light and a dark blue 2" square of suede with no reaction at all.
Have any of you tested your colony for aggressive defensiveness? What method worked for you?