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Relationship Between Colorado Potato Beetle (Coleoptera: Chrysomelidae) and Tobacco Hornworm (Lepidoptera: Sphingidae) Resistance in Lycopersicon hirsutum f. glabratum

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Segregation patterns of glandular trichome-mediated resistance to Leptinotarsa decemlineata (Say) and to Manduca sexta (L.) were examined in short-term foliage consumption bioassays for the following plant populations: Lycopersicon esculentium Mill. 'Walter', susceptible parent; . L. hirsutum f. glabratum C. H. Mull, PI 134417,resistant parent; F2 (('Walter' × PI 134417) × ('Walter' × PI 134417));'Walter' × F1 ('Walter' × PI 134417); and F1 ('Walter' × PI 134417) × PI 134417. The component of L. decemlineata resistance associated with the foliar glandular trichomes segregated in a manner identical to M. sexta resistance. Because the levels of resistance to both insect species were highly correlated in segregating F1 backcross populations (T = 0.827; P ≤0.001), a common mechanism is indicated. PI 134417also possesses aL. decemlineata resistance component associated with the foliar lamellae which causes extensive mortality (98%) of late instars and pupae compared with beetles reared on foliage of the commercial tomato cultivar 'Walter' (x mortality, 57%). F1 plants from crosses between 'Walter' and PI 134417 were shown to lack the trichome-mediated component of resistance to L. decemlineata but to possess significant levels of the lamella-based resistance component (x mortality, 89%).Thus, the lamella-based and trichome-mediated resistance components are under separate genetic control.

Document Type: Research Article

Publication date: December 1, 1989

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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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