Environmental Entomology (1984) 13, 539-542

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Murray B. Isman and Eloy Rodriguez (1984)
Feeding and growth of noctuid larvae on foliar material and extracts of guayule, related species of parthenium, and F1 hybrids
Environmental Entomology 13 (2), 539-542
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. argentatum Gray, or an F1 hybrid of guayule with P. tomentosum. A mixture 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.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): Murray B. Isman

Research topic(s) for pests/diseases/weeds:
control - general

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.

Spodoptera exigua
Helicoverpa zea