Abstract
SUMMARYThe effectiveness of half the recommended dose of fluvalinate (Apistan) and flumethrin (Bayvarol) against Varroa jacobsoni was tested in honey bee colonies containing sealed brood. The experiment was carried out in Zaragoza, Spain, in five apiaries of 15 hives each, containing colonies of Apis mellifera mellifera. Each apiary was divided into three groups. Hives in one group were each treated with a polyvinyl chloride (PVC) strip containing 0.8 g of fluvalinate. Hives in the second group each received two polyethylene strips each containing 3.6 mg of flumethrin. The third group served as a control and received no treatment. Treatment strips were left in the hives for 28 days. Varroa infestation rates were measured in adult bees and sealed brood before and after the treatment. Both of the tested acaricides reduced the infestation rate to practically zero in both adult bee and sealed brood Infestations. Infestation rates in the two groups of treated colonies were significantly different from those in control colonies, in which the varroa populations showed irregular but Increasing infestation rates. The results show that Apistan and Bayvarol can be used successfully for a period of 28 days, in the presence of sealed brood, at half the dose suggested by the manufacturers.
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