Abstract
Laboratory bioassays demonstrated the toxic effects of three insect growth regulators (diflubenzuron, teflubenzuron, and fenoxycarb) to 1- and 7-d-old larvae of corn earworm, Helicoverpa zea (Boddie), and fall armyworm, Spodoptera frugiperda (J. E. Smith). All compounds were effective against larvae of both species. Fenoxycarb was more active against 1- and 7-d-old corn earworm larvae compared with diflubenzuron or teflubenzuron; all compounds were equally active against 7-d-old fall armyworm larvae. Larvae exposed to fenoxycarb lived up to 10times longer than larvae treated with diflubenzuron or teflubenzuron. All three compounds might control the corn earworm and fall armyworm in agronomic crops.
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