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How did insects become resistant to DDT

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Insects became resistant to DDT because in the late 1900's farmers sprayed it on their crops to keep them from eating them.

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User Orome
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Mosquitoes resistant to DDT are also resistant to mosquito net insecticide. ... Asresistance to pyrethroids and DDT is already spreading in mosquito populations, scientists say that this knowledge could help improve malaria control strategies.
User Mittmemo
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