Laboratory bioassays conclusively demonstrated the toxic effects of the insect growth regulator (IGR) RH-5992 against 1- and 7-d-old larvae of the corn earworm, Helicoverpa zea (Baddie), and fall army worm, Spodopterafrugiperda (J. E. Smith). The IGR exhibits toxicity to both species at similar concentrations. Mortality ≥90% for both species was achieved at concentrations of >0.001% (AI). Larval death generally occurred within 4-7 d after treatment of both 1- and 7-d-old corn earworm and fall armyworm larvae. RH-5992 may be of value in controlling the com earworm and fall armyworm in integrated and areawide management programs.
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Chandler et al. (1992) studied this question.