In a message dated 14/09/2009 13:24:08 GMT Daylight Time, [log in to unmask] 
 writes:

<<How many  insects 
sub-lethally affected does it  take to affect a swift lethally  (haven't 
seen 
many of those around  this year).>>



I don't know, but if a predator keeps feeding on  poisoned prey, then the 
poison is going to accumulate in its tissues unless it's  metabolised or 
eliminated fairly quickly. Top predators are particularly  vulnerable; remember 
DDT and peregrines?  

Regards,

Robert Brenchley
Birmingham  UK


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