Fries, I. 1989. Short-Interval Treatments with Formic Acid for Control of Varroa jacobsoni in Honey Bee (Apis mellifera) Colonies in Cold Climates. Swedish J. agric. Res. 19: 213-216. Authors address: Swedish University of Agricultural Sciences Bee Division Box 7024 S-750 07 Uppsala Sweden BITNET: [log in to unmask]