Really the question is when will there be drones galore. You need lots of drones that will be mature when the virgins fly. Drones need 12 days or so to mature after they emerge. I have read that if there are lots of drone pupae at the purple eye stage of development you can graft and they will be good to go by the time the virgin is ready.
A post a short while back spoke about last years drones still hanging around. You want to make sure the ones you are seeing are not past their pull dates.
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