We have been using the Wally Shaw method for a couple of years with great success, but this year we have encountered some problems. Two out of the three colonies that we have used the method on the queen has swarmed a couple of days after being put back into the brood box in the original position. We have knocked down any queen cells on the two frames of brood in that box, before putting the queen back in on day 9. We are not doing anything different from previous seasons, but for some reason they have swarmed. Would it be an idea to use a queen excluder as a queen includer under the brood box for a week when putting the queen back into the original brood box?