Peter provided the below link to some interesting information. One thing that got my attention was this: "Bottom screens are also an effective control method. They are basically a wood-bound screen that is placed underneath the brood chamber. The mites fall through the screen onto the bottom board or ground." What got my attention was that not so long ago there was some interesting comments that the Bottom Screen wasn't effective enough to make a difference in mite control. Now here is an article that shows it as an effective control. Peter was it you that did some study or reported some study that mentioned that this type of control was basically didn't show enough control to be useful? OhioBeeFarmer Getting youth involved in Beekeeping http://www.homestead.com/BeeKeepers/BeesRUs.html http://www.homestead.com/BeeKeepers/Opening.html -------Original Message------- http://www.ent.uga.edu/bees/Disorders/Varroa_mites.htm -- Peter Borst <[log in to unmask]>