Ecological Toxicology and Human Health Effects of Heptachlor

Abstract
The chlorinated cyclodiene heptachlor was granted US registration as an agricultural and domestic insecticide in 1952. Through the mid-1960s, it was primarily employed in soil applications against agricultural pests and termites (Gosselin et al. 1976; Murphy 1986). In 1962, Canada banned heptachlor as a seed treatment (McEwen and Stephenson 1979), while in Japan, the only accepted use for heptachlor was in termite control (IARC 1974). According to the FAO/WHO (1971), the relative worldwide use of heptachlor in 1970 was 5% in Africa, 5% in Canada and the US, 15% in Asia, 15% in South America, and 60% in Europe.

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