Abstract
Research was conducted utilizing DDT resistance as a criterion for studying the possible existence of host specific strains of the boll worm, Heliothis zea (Boddie). Bollworm larvae were collected from several hosts growing in representative cotton-producing areas of Louisiana and the response of their laboratory-reared progeny to DDT was determined by the topical application technique. It was found that within the same representative area, progeny of populations taken from hosts having a previous history of very limited insecticide treatment responded essentially the same to DDT as progeny of populations associated with cotton having a long history of intensive insecticide treatment. DDT resistance in boll worm populations tended to be associated with areas rather than hosts, indicating that host-specific strains probably do not exist in Louisiana.
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