Free access
Volume 30, Number 1, 1999
Page(s) 13 - 17
Apidologie 30 (1999) 13-17
DOI: 10.1051/apido:19990102

Detection of resistance in US Varroa jacobsoni Oud. (Mesostigmata: Varroidae) to the acaricide fluvalinate

Patti J. Elzen, Frank A. Eischen, James R. Baxter, Gary W. Elzen and William T. Wilson

USDA, ARS, Beneficial Insects Research Unit, Kika de la Garza Agricultural Research Center, Weslaco, TX 78596, USA

Abstract - Populations of Varroa jacobsoni Oud. from three geographic regions of the United States were assayed for resistance to fluvalinate. A bioassay using a discriminating concentration estimated to cause approximately 80-90 % mortality in a fluvalinate-susceptible strain of V. jacobsoni was used to compare percent mortalities between locations. An average of 73.3 % mortality was seen in two additional operations in Texas, not significantly less than the susceptible strain. An average of 23.7 % mortality was found for mites tested in Florida that had originated from field control failures; Florida test mortality was significantly less than that of the susceptible strain. An average of 65.1 % mortality was found for mites tested in California, also significantly less than mortality of susceptible mites. However, no field control failures were reported for the mites tested in California. © Inra/DIB/AGIB/Elsevier, Paris

Key words: Varroa jacobsoni / fluvalinate / resistance / US / honey bee / Apis mellifera / Apistan®