Well I ran out and treated app 500 colonies when the MAQS became available this Spring. Temperatures were well within the parameters for effect. Three weeks after application I am seeing much broodlessness and apparent queenlessness. However this Spring has seen a great build up in almonds followed by heavy swarming followed by cold ( for Calif. ) temps which have very effectively shut down nectar flows, so I am not sure of what I am seeing, for example swarm queens that have not begun to lay. But I am seeing a big break in brood rearing.
Would any one care to share their experiences regarding MAQS and loss of queens?