Laboratory tests with a synthetic pyrethroid, NIA-33297 (m-phenoxybenzyl cis, trans- (±)-3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylate) indicated it was more toxic than methyl parathion against the tobacco budworm, Heliothis virescens (F.), the bollworm, H. zea (Boddie), and the boll weevil, Anthonomus grandis Boheman. In field tests, NIA-33297 gave control of Heliothis spp. equal to methomyl and monocrotophos.