Reply to Message

Natural pesticides like rotenone and pyrethrin break down rapidly. That's why they have to be applied frequently. Makes them safer as well, since they don't have long-term toxicity. Good organic farmers use a variety of pest control strategies other than spraying pesticides, such as interplanting different crops to confuse or repel pests, creating conditions that encourage predators, or releasing predators.

I suspect the study you link to was funded by agribusiness interests.