Tests with DDT on the More Important Cotton Insects

Abstract

In cage and laboratory tests, a 2% DDT-pyrophyllite dust was very effective when used to control the cotton boll-worm, Heliothis armigera, but comparatively ineffective when used to control the boll weevil, Anthonomus grandis, the leaf worm, Alabama argillacea, and the aphid, Aphis gossypii. DDT appeared to act as both a stomach poison and contact insecticide against the bollworm, but the contact action is believed to be the more important.