Response of Five Insect Species to a Botanical Insecticide, Rhodojaponin III

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Rhodojaponin III is a grayanoid diterpene compound with insect antifeedant and insecticidal properties. The compound was isolated from the Chinese insecticidal plant Rhododendron molle (G. Don) and tested against five species of agricultural and stored-grain insects in laboratory and greenhouse bioassays. At LC50 and EC50 (the effective concentration for 50% growth inhibition),. rhodojaponin III was 198 to 218 times more active for fall armyworm, Spodoptera frugtperda (J. E. SmIth), larvae than for tobacco budworm, Heliothis virescens (F.), larvae. Results of tests with potted plants indicated that rhodojaponin III at 150 ppm reduced the plant damage index from 96 to 13% for S. frogiperda, from 99 to 2% for Colorado potato beetle, Leptinotarsa decemlineata (Say), and from 72 to 55% for greenbug, Schizaphis graminum (Rondani). Against adults of the confused flour beetle, Tribo/ium confusum (Jacquelin du Val), 50 ppm rhodojaponin III in flour caused 89% mortality and totally inhibited fecundity. We obtained similar results with an ethyl acetate extract of the dried flowers of R. molle.

Document Type: Research Article

Publication date: June 1, 1993

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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