“The dose makes the poison” maxim relies on the finding that all chemicals, even water and oxygen, can be toxic if too much is consumed or absorbed. And, for a consumer-friendly understanding of what a pesticide is, here’s a good definition to keep in mind: a pesticide is any substance or technology that is used to kill, manage or repel pests.
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https://www.azfb.org/Article/How-We-Use-Pesticides-in-Agriculture