Yesterday I pulled the last of my honey off. I took all of the supers off, leaving each hive with the 2 deeps (6 hives). At that time, I gave each hive a treatment of Apiguard, from the tub (not the pre-measured). I have a super of partially capped honey that I will give back to each hive once the treatment is complete.
Temperature yesterday was up to 90F. I applied the Apiguard at around 12-1pm.
Mite load is medium to heavy, with some DWV.
This morning I quickly pulled the tray on the SBB on two of my hives, and was shocked to find the first covered with a layer of pupae parts. And plenty of mites (not a suprise). The hive next to it had pupae body parts too, but much fewer. I only had a cursory look at the SBB tray.
I know it can stop a queen from laying, but would Apiguard kill brood (the documentation says not until it is in the 100's F), and if it would, it seems like capped pupae would be the last to die.
Or... could it trigger some hygiene thing where they chew out the ones they know are infected? Or is it related to me removing some stores, although I don't think they'd attack pupae in that case?
I'll check the hives out when I get home from work to see what the insides look like, but if you have any insight or similar experience, I'd appreciate your thoughts.