Heptachlor

n. toxic chemical substance formerly used as an insecticide

Heptachlor is an insecticide that usually comes in the form of a white or tan powder, the tan powder being of lower purity. It is similar to insecticide chlordane. Heptachlor was widely used in the past to kill insects. In 1962, Rachel Carson's Silent Spring questioned the safety of heptachlor. The Environmental Protection Agency has banned the sale of heptachlor products in the United States and virtually eliminated its use for any purpose. Due to its highly stable structure, heptachlor can persist in the environment for decades. The amount that can be present in different foods is regulated.
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n. heptachlor, toxic chemical substance formerly used as an insecticide

An insecticide that was banned on some food products in 1975 and in all of them 1978. It was allowed for use in seed treatment until 1983. More recently it was found in milk and other dairy products in Arkansas and Missouri where dairy cattle were illegally fed treated seed.

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