Makes me wonder if it could be that some of the pesticides attract the bumblebees, but not because of the absence of parasites.
Presumably clean soil also has no mites or parasites in it.
Presumably clean soil also has no mites or parasites in it.
There was a wasp nest on the roof and the wasps kept going for the part of the window where the stickers had been. Must have been something in there that attracted them.
> Another possibility is that the queens could have developed an "acquired taste" for pesticides, as researchers put it, due to prior exposure in their environment.