I put robbing screens on in September on many of my solid bottom board hives. They were all thriving. I discovered today that most of those hives have a ton of dead bees at the entrance and the hives are lost. There is plenty of honey in the hives and they were treated with OA in August 3 straight weeks and throughout the summer as well. There is a quarter inch hole drilled up top for upper ventilation. Did the robbing screen cause the issue? The base of the robbing screen doe not sit flush up against the entrance, there is a half an inch or more space from the entrance along the width of the bottom board.
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