Talking with Nod, they say that the danger of expired MAQS isn’t that it will be ineffective, it’s that the substrate will break down too much which causes the rate of formic release to potentially be too fast causing colony damage. This can also happen if it’s stored at too high a temperature. MAQS must be stored out of direct sunlight and below 77f.

Did you do mite counts?  Applying treatment if counts are well above threshold can just hasten the demise of a colony that’s on it’s way to collapsing.

David Baker
To Bee or Not To Bee
Denver, USA.
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