Effect of acaricide resistance on reproductive ability of the honey bee mite Varroa destructor |
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Authors: | Martin Stephen J Elzen Patti J Rubink William R |
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Institution: | (1) Laboratory of Apiculture and Social Insects, Department of Animal and Plant Sciences, Sheffield University, Western Bank, Sheffield, S10 2TN, UK;(2) USDA, Honey Bee Unit, 2413 E. Highway 83, Weslaco, TX 78596, USA |
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Abstract: | The reproduction of pyrethroid-resistant Varroa destructor mite, a brood parasite of honey bees, was observed in Weslaco, Texas, and the results compared with known susceptible mite
populations from other studies. Seven Apis mellifera colonies that had mite populations resistant to the acaricide Apistan™ were used. Pyrethroid-resistance was confirmed when only 17% rather than 90% of mites confined in dishes containing Apistan™ died after 12 h of exposure. The average number of eggs laid by resistant mites invading worker and drone cells was 4.4 and
5.4 respectively. This is similar to the number of eggs laid by susceptible mites in worker (4.4–4.8) or drone (4.7–5.5) cells.
Also the average number of fertilised V. destructor female mites produced by resistant mites in worker (1.0) and drone (2.1) cells were similar to the number produced by susceptible
mites in worker (0.9) and drone (1.9–2.2) cells. In addition, no major differences between the resistant and susceptible mite
populations were observed in either worker or drone cells when six different reproductive categories and offspring mortality
rates were compared. Therefore, it appears that there is little or no reproductive fitness cost associated with pyrethroid
resistance in V. destructor in Texas.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | Varroa destructor Apis mellifera pesticide resistance mite reproduction Africanised bees |
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