I need to ask, How do you apply the acetic acid ? The Acetic acid you need is 80% concentrated so sensible precautions are needed. There are various methods. Easiest is probably to place all the frames into a large plastic sack, pour in about a quarter of a pint of acetic, seal the sack and leave for a week. Then remove (still being careful of the acid) and air until needed. Or you could stack up the boxes of frames and between each one place a wodge of cotton wool or plastic sponge and pour maybe an eights of a pint on each. Seal the boxes with tape to keep the fumes in as much as possible. This method has the advantage of sterilising the boxes as well. Don't do it near the house as the surrounding area will smell of vinegar. Chris -- Visit www.honeybeeworld.com/bee-l for rules, FAQ and other info ---