I never use them for new packages and have never had a problem. If you want to use them I would say about the time you are ready to super you could remove it. Let someone else chime in, see what they have to say.
I used them thinking about defense then thought about cold weather and all thinking that played a part. I got 3 packagese at the same time figuring the reducer was to help the defense thing...it appears they all are doin their buisness where they should be.
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.
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