Feeding and Growth of Noctuid Larvae on Foliar Material and Extracts of Guayule Related Species of Parthenium , and F 1 Hybrids

Publisher Website
Google Scholar
Abstract
Artifical diets incorporating powdered foliage or foliar extracts of Parthenium tomentosum DC. or P. schottii Greenman inhibited feeding, growth, and dietary use by 3rd-instar larvae of the beet armyworm, Spodoptera exigua Hübner, relative to larvae feeding on diets incorporating foliage or foliar extracts from guayule, P. argentatu Gray, or an F 1 hybrid of guayule with P. tomentosum. Amixture of sesquiterpene lactones isolated from P. schottii added to an artifical diet inhibited feeding, but did not deter growth or dietary use by larvae. Foliage or foliar extracts of P. schottii added to diets also significantly inhibited growth and dietary use by 3rd-instar larvae of the bollworm Heliothis zea (Boddie), although there was no reduction in consumption rate. In contrast, powdered inflorescences of P. schottii or extracts thereof, both rich in sesquiterpene lactones, deterred neither feeding nor growth of H. zea when added to artificial diets. Confertin, the principal sesquiterpene lactone of P. schottii foliage and inflorescences, had no effect on feeding or growth of 3rd-instar larvae, even at a concentration which strongly inhibits growth of neonate H. zea larvae. Chemical factors in P. schottii and P. tomentosum foliage appear to inhibit larval growth of both S. exigua and H. zea, although a contribution to that inhibition by sesquiterpene lactones is uncertain.

This publication has 0 references indexed in Scilit: