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A bag of lead arsenate on display at the Wenatchee Valley Museum & Cultural Center. The pesticide lead arsenate was introduced in the 1890s. Not long after that, Washington growers were using it to protect their apples from a crop-ruining pest.

How A Banned Chemical Helped Clean Up Washington’s Orchards

DDT was banned in 1972 because of its harm to human health and the environment. DDT can take more than 15 years to break down in the environment, meaning it leaves a toxic trace for many years. But when it replaced lead arsenate in the late 1940s, “DDT was the savior.”





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