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Encelia farinosa Gray (Asteraceae: Heliantheae), a common shrub of the Sonoran desert, contains both sesquiterpene lactones and chromenes. Chloroform extracts of E. farinosa leaves were deterrent to larvae of Heliothis zea (Boddie) in choice tests, but farinosin, a eudesmanolide sesquiterpene lactone from E. farinosa, was not. Five sesquiterpene lactones from different Asteraceous genera were examined for their effect on the relative growth rate (RGR) of H. zea at 0.1% fresh weight in an artificial diet. Only dchydroleucodin, a guaianolide sesquiterpene lactone from Artemisia tridentata spp. vaseyana, reduced growth. Three closely related chromenes (precocene 1 and 2 and encecalin) were examined for their effects on survivorship (SR) and RGR of H. zea at five different concentrations. Precocene 1 and 2 exhibited the greatest activity on survivorship and growth rates, whereas encecalin was less active.
Document Type: Research Article
Publication date: October 1, 1983
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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.