Efficacy of oxalic acid and Apiguard against varroa mites in honeybee (Apis mellifera) colonies
Gregorc, A.(Agricultural Inst. of Slovenia, Ljubljana (Slovenia))E-mail:[email protected]
This trial assessed the comparative efficacy of oxalic acid solution (OA), which consists of 2.9% oxalic acid and 31.9% sugar in water, and Apiguard, a thymol gel, in controlling the honeybee mite Varroa destructor. In comparison with untreated control colonies, mite mortality increased significantly in both Apiguard and OA treated colonies. The mite mortality was 41.98% (+/-21.59) after two Apiguard applications, on August 7 and 21, and 42.63% (+/-25.22) after three OA applications, on August 7, 14 and 21. All applications were given to colonies with brood. Further three OA treatments conducted during October, on previously untreated control colonies, resulted in mite mortality of 87.92% (+/-12.66). However, these levels of mite reduction were insufficient for all colonies to survive the winter. The results indicate that OA and Apiguard are of limited use during periods with brood.
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