when were pesticides created
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when were pesticides created
how were pesticides created
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when did pesticides start being used
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when did farmers start using pesticides
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when were pesticides created, how were pesticides created, when were pesticides first used, how were pesticides invented, when did pesticides start being used, when were pesticides first used on crops, history of pesticides timeline, how long has pesticides been around for, history of pesticide use, when did farmers start using pesticides, when did pesticides become popular, when did pesticides become a problem, pesticides of plant origin, the earliest substances used as pesticides, history of pesticide regulation