Abstract
The effects of the antibiotic Terramycin and the acaricide Apistan were tested on colonies of honey bees, Apis mellifera L., infested with the parasitic mite Varroa jacobsoni Oudemans. Interest in antibiotics stems from the possibility that V. jacobsoni vectors pathogens. Each of 20 colonies randomly received 1 of 4 treatments : (1) 7 applications (28.3 g, 198.1 g total) of a standard Terramycin and powdered sucrose mixture, (2) 2 Apistan strips, (3) Terramycin and Apistan, or (4) no treatment as an experimental control. Terramycin increased the body weight of hive bees of mixed ages and of newly emerged adult bees. Apistan increased the body weight of hive bees of mixed ages, maintained colony population size during a period of apiary-wide decline, decreased the number of V. jacobsoni per newly emerged bee, and decreased the incidence of misshapen newly emerged bees. Overall, the effects of Terramycin antibiotic and Apistan acaricide on V. jacobsoni-infested colonies were favorable or neutral, and no interactions between the 2 products were detected.
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