From: "Peter Edwards" "Substances such as thymol or formic acid have a
> much simpler structure which cannot be broken down"

The most commonly quoted mechanism is if say the simple chemical penetrates
the cuticle, a mite evolves a thicker cuticle which gives it an advantage
and its offspring become dominant - unkless the mutaion also reduces say
reproduction, when it may not .

But I am not a scientist either.   Is Max Watkins in the house?

Robin Dartington

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