Preliminary evaluation of synthetic miticides and natural compounds to control Varroa destructor
2004
Lee, M. | Chang, S.J.,National Inst. of Agricultural Science and Technology, Seodun-Dong 61 Suwon 441-100 (South Korea) | Hwang, C.Y. | Chang, Y.D. | Woo, K.S.
Varroa destructor has brought severe economic damages to the beekeeping industry in Korea. For the national control program, the government has provided each apiary with synthetic miticides. The miticides, essential oils, and organic acids were pre-evaluated with respect to their efficacy against Varroa mites in two commercial apiaries. Mites from apiaries in Suwon and Chungju were assumed to be resistant and susceptible (efficacy 83.2 percent in 24 hrs.), respectively, to fluvalinate.Thymol and formic acid reduced the population of mites on the 8th day after treatment. Thymol treatment attracted many robbing bees. Formic acid was effective in reducing the population of mites. It had an efficacy of 100 percent in 8 days and 71.8 percent 24 hrs. after treatment. Bromopropyrate fumigant was moderately effective, with an efficacy of 66.5 percent in 24 hrs. Other treatments did not reduce the population of bee mites or killed less than 40 percent of the mites. Formic acid may be recommended for the reduction of Varroa infestation under apiary conditions in Korea. Absorbent materials, temperature range, and the negative effects on bee brood of formic acid application will be investigated in the next phase.
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