Abstract
RH 5849 (1,2-dibenzoyl-1-tert-butylhydrazine), a nonsteroidal ecdysone agonist representative of a novel class of insect growth regulators, was tested against larval and adult Japanese beetles, Popillia japonica Newman; and fall armyworm, Spodoptera frugiperda J.E. Smith, caterpillars in turf. RH 5849 was effective against Japanese beetle grubs at concentrations as low as 1 ppm in soil. Symptoms of toxicity included discoloration, weight loss, apparent neurotoxic effects, cessation of feeding, and developmentally premature, lethal molting at higher rates. Sublethal effects on overwintered third instars included earlier formation of prepupae. Against second-instar grubs, RH 5849 was nearly as effective as isazophos (Triumph 4E) at comparable rates in the field. Subsequent egg production by female beetles that fed once on RH 5849-treated sassafras foliage was reduced by 66-74%, but hatching success of eggs was not affected. RH 5849 caused premature molting and 100% mortality of fall amlyworms fed tall fescue foliage that wassprayed once with 30 or 100 ppm, or treated systemically through the roots. Systemic activity of RH 5849 is noteworthy because it could provide simultaneous control of both root-feeding and foliar-feeding turfgrass pests.
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