Speaking of Dr. Keith Delaplane, he had a series on the RFD channel on satelite tv about bee keeping. The best I remember they where eight parts to this show. I only got to see three of the episodes. I would like to see the whole series, if any body knows where to find it. Also I remember in one of the shows I did see, he did recommend coating the inside and outside of bee hives using copper napthenate.