Typically you need some temperature in your compost pile so the microbes
have the energy to decompose the difficult chemical structures of
pesticides. All those chlorines and bromines and benzene rings in most
pesticides require production of seriously high-energy-requiring enzymes
to allow break-down of the pesticide.
But that's the right amount of heat - not too much, not too little. If
you see "compost" that has turned black, the composter fried the most
important critters, and the pesticides are probably still present.
Compost is supposed to be dark brown, not black. Nor do the pesticides
generally decompose if the compost turns anaerobic.
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