In a message dated 1/28/2010 4:23:22 A.M. Mountain Standard Time,  
[log in to unmask] writes:

Re:  fluvalinate has a half-life of seven years
Paul asks?

True,  but what evidence do you have that 2-3 year old residues have any  
appreciable biological activity; i.e. any appreciable impact on the  
physiology of the mites?   
We're detecting the same chemical (fluvalinate), not breakdown residues of  
the chemical - so since the chemical hasn't changed its structure, don't  
know why activity should change.
 
Paul, can you cite studies that say that the chemical's properties change  
with age


And  is your evidence direct or theoretical?
Direct, if you mean, evidence that fluvalinate remains for years in  combs. 
 We've analyzed comb from operations that stopped using the chemical  years 
ago, are now more or less organic - in an isolated area where the only  
pesticides seen at detectable (low ppb levels) are miticides.  We can't  pick 
up any other pesticides.
 
Jerry





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