روزنامه با شماره پیاپی سال 2003

10

171

180

The antivarroa action of propolis and its synergism with temperature was investigated calorimetrically and respirometerically, using female Varroa destructor mites from adult workers, worker- and drone broods. The treatment of Varroa mites with 4% propolis affected their metabolic activity, with the influence directly related to the temperature of treatment. The changes in heat production and oxygen consumption rates, as a function of temperature, showed similar patterns before as well as after treatment with 4% propolis. The mites collected from worker- and drone broods reacted similarly to propolis treatment at different temperatures. In contrast, the mites from adult workers, phoretic mites, responded differently: the treatment with 4% propolis at 40 °C resulted in 100% mortality of mites from adult workers but only reduced the heat production rate of mites from worker- and drone broods by 68 and 60%, respectively. Exposure of mites to 45 °C agitates them as witnessed by the elevated heat production rates (23.5±2.5 μW/mg compared to that at 35 °C with 14.4±1.0 μW/mg). After treatment with propolis at 45 °C all mites died regardless of their origin indicating that the simultaneous use of varroacides and high temperature treatment for a short period of time could be more effective rather than the prolonged use of either method.

Food Microbiology

2003

Food Microbiology