I'm not making a testimonial as to the effectiveness of FGMO for treatment of mites at this time. But I would like to offer some thoughts on the delivery method I've been using. Basically, it is nothing more than a standard grease patty with FGMO substituted for 50% of the Crisco shortening, and powdered sugar substituted for 25% of the granulated sugar. The recipe for 3 pounds of mix is as follows: 3 cups (1 1/2 lb) granulated sugar 2 cups (1/2 lb) powdered sugar 1 cup (1/2 lb) Crisco 1 cup (1/2 lb) Food Grade Mineral Oil Ingredients are combined and mixed at a medium-high speed. The resulting mix has the consistency of an extra-light cake frosting. Notes/observations are as follows: 1. The mix with 100% granulated sugar wasn't too stable. That is, the MO tended to separate out fairly quickly. The powdered sugar substitution improved the stability. Another solution might be to run the granulated sugar through a high-speed blender to pulverize it somewhat, thus increasing the sugar surface area to be coated by the MO and shortening. Yet another solution might be to simply add more sugar to the mix. That would likely speed up the rate at which the bees would work the mix. I don't know the optimum consumption rate for effective treatment so I can't offer a recommendation here. My gut feeling is that I wouldn't add more sugar. Dr. Rodriguez indicated that a small amount of MO goes a long way so quick consumption probably is not necessary. 2. 3 lb of this mix fits nicely in a gallon food storage bag. To apply the mix, I close the top of the bag with a twist tie and I cut off one of the corners of the bag. I then squeeze the bag, thus extruding the mix through the small hole in the corner of the bag and applying the mix to the top bars in the brood chamber of the hive. 3. A food storage bag works nicely for a small number of hives. A pressurized canister with a hose attachment would be handy for treatment of a larger number of hives. 4. Top bars that have never been exposed to this treatment will absorb a fair amount of MO out of the mix. This leaves behind a somewhat "dry" mix that presumably is less effective as a treatment for varroa mites. Subsequent applications will leave a greater amount of MO available for mite treatment. 5. I expect that treatment with MO, whether by this method or any other, needs to be fairly continuous year round. The possible exception might be during winter months where there is a break in brood rearing. If mites are reduced to an acceptable level at the point where brood rearing stops, it may not be cost effective to treat again till near the time when the queen begins laying again. Comments, direct or to the list, are welcome. Mike Swintosky Dellroy, Ohio