Of course there are exceptions, but as a general rule, mid summer, feral hives don't have the populations our managed hives do.
I use the reducers to help them defend themselves... smallest until they have to take a number to enter, then enlarge until the number machine appears again, then wide open..... :lpf: As population dwindles in September, I start reducing it again. You'll get a feel for it.
Some folks say it also helps in small hive beetle control.
Regards,
Steven