Re: Apigaurd and how to uses on a double deep hive. Whats's your experiences.
I have always put in on top of my douple deep brood chambers. The thymol vapor is heavy and will sink which is only part of it's success. The other part is the bees will carry it out of the hive as trash and along the way distribute it thought the hive.
I found it much easier to make a 3/4 spacer when applying apiguard. You need at least 1/4 inch above the treatment for the bees to access it (i use pre packaged trays).
I found apiguard to be effective but every colony reacts to is differently. I had haves that never skipped a beat to others who would not go back in to the hive for a week. Literally. One of my russian hives bearded front, back, sides by the thousands for 6 days. Weather was sunny and in the low 80's. The hive right next to it, nothing, and treatment was applied the same day.
Pearl City Apiary Michael and Loucil Bach