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Resistance Mechanisms of Lycopersicon pennellii Accessions to Spodoptera littoralis (Boisduval) (Lepidoptera: Noctuidae)

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Resistance mechanisms of 5 Lycopersicon pennellii (Corr.) D'Arcy accessions to Spodoptera littoralis (Boisduval) were compared with that of 2 commercial cultivars of L. Esculentum with the ultimate intent of using L. pennellii as a source of resistance to be incorporated into L. esculentum. First instars were trapped by the sticky exudate which covered the leaf surface of L. pennellii, but 2nd-5th instars overcame this physical barrier. Second and 3rd instars were influenced by an extractable substance present within, but not on, L. pennellii leaves, which had effects similar to juvenile hormone. The L. pennellii accession Sisicaya 751 had the highest apparent level of this juvenile hormone-like activity among those tested. Leaf feeding or incorporation of material from hexane or acetone extracts of L. pennellii leaves into artificial diet or application of extracts directly to larvae caused high larval mortality, adult morphological deformation, male sterility, and inhibited oviposition. Large larvae (4th and 5th instars) were not affected by this juvenile hormone-like substance. Collectively, the data suggest that certain accessions of L. pennellii could serve as sources of resistance to S. littoralis which could be incorporated into an L. esculentum background.

Document Type: Research Article

Publication date: December 1, 1997

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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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