RH-5992, A NEW INSECT GROWTH-REGULATOR ACTIVE AGAINST CORN-EARWORM AND FALL ARMYWORM (LEPIDOPTERA, NOCTUIDAE)

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 (Boddie), and fall armyworm, Spodoptera frugiperda (J. E. Smith). The IGR exhibits toxicity to both species at similar concentrations. Mortality greater-than-or-equal-to 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 corn earworm and fall armyworm in integrated and areawide management programs.