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Volume 31, Number 3, May-june 2000
Page(s) 437 - 441
DOI: 10.1051/apido:2000134

Apidologie 31 (2000) 437-441

Control of Varroa jacobsoni Oud. resistant to fluvalinate and amitraz using coumaphos

Patti J. Elzena - James R. Baxtera - Marla Spivaka,b - William T. Wilsona

aUSDA-ARS, Kika de la Garza Subtropical Agricultural Research Center, 2413 E Hwy, 83, Weslaco, TX 78596, USA
b219 Hodson Hall, 1980 Folwell Ave., Univ. Minnesota, St. Paul, MN 55108, USA

(Received 10 March 1999; revised 6 December 1999; accepted 27 December 1999)


We conducted laboratory tests investigating the mortality of mites infesting honey bee colonies in Minnesota after exposure to fluvalinate, amitraz, or coumaphos. Results indicated that these mites were not only resistant to fluvalinate, but also to amitraz. Coumaphos was effective against these resistant mites. A separate field trial was conducted with the same hives as those used in the laboratory test. The field trial supported the laboratory results, showing that mites in Minnesota are resistant to both fluvalinate and amitraz, and that coumaphos is effective in controlling these mites. This represents the first known reported case of amitraz resistance in Varroa jacobsoni in the U.S.A.

Keywords: Varroa jacobsoni / resistance / fluvalinate / coumaphos / amitraz

Correspondence and reprints: Patti J. Elzena

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