See Tim Lambert's post. His conclusion:
So the people with significant responsibility for the resurgence in malaria were the chemical companies that stymied efforts to reduce the agricultural use of pesticides [resulting in increased mosquito resistance to DDT]. And it was chemical companies that helped set up the astroturf junkscience site that has attempted to blame Rachel Carson for causing the resurgence. Nice. It’s like a hit-and-run driver who, instead of admitting responsibility for the accident, frames the person who tried to prevent the accident. Bastards.