Busyknight mentioned the possibility of alternating flumethrin and
   fluvalinate to avoid varroa resistance to either.
 
   While the strategy is reasonable, my understanding is that the 2
   materials are so close chemically, that resistance to either would
   likely be resistance to both. For this alternation to be successful,
   control products with different modes of action would be necessary.
 
   Regarding cost to beekeepers: there was a discussion here, half a year
   ago. As I recall, there was quite a range in the cost of Apistan.
   Bayvarol was not available in many countries, and its cost was a bit
   higher than the average cost of Apistan. I don't remember if both
   materials were available in the same country.
 
 
   Kerry Clark, Apiculture Specialist
   B.C. Ministry of Agriculture
   1201 103 Ave
   Dawson Creek B.C.
        V1G 4J2  CANADA          Tel (604) 784-2225     fax (604) 784-2299
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