Control ofVarroa jacobsoniOud. resistant to fluvalinate and amitraz using coumaphos

Abstract

-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.

Pesticide Residues in Bee Products

“…Nowadays, the beekeepers have stopped using it because the mites developed resistance towards this chemical. (Elzen et al, 2000;Milani et al, 1995;Thompson et al, 2003).…”

Evaluation of a thymol formulation efficacy against Varroa destructor under Central Greek climatic conditions

“…Also, another serious problem was that in many areas the mite populations became resistant to chemicals (Lodesani et al 1995, Milani 1999, Elzen et al 2000, Spreafico et al 2001). …”

In-Hive Miticides and their Effect on Queen Supersedure and Colony Growth in the Honey Bee (Apis mellifera)

“…These chemicals are administered in colonies as miticide-impregnated strips placed between frames of brood, and kept in the hive for several weeks [16]. Despite their efficacy when first approved for use in apiaries, mites quickly developed resistance to both fluvalinate [17][18][19][20] and coumaphos [21]. Continuous application of these lipophilic chemicals has led to their permanent presence in the wax comb [22][23][24][25], especially in commercial beekeeping operations [26,27].…”