Abstract

The accession PI 134417-3 of the wild tomato species Lycopersicon hirsutum f. glabratum C. H. Mull., which was previously selected for its high level of resistance to Manduca sexta L. and which is highly resistant also to Heliothis zea (Boddie), was found to be highly resistant to the Colorado potato beetle (CPB) Leptinotarsa decemlineata (Say). Although potato beetle adults laid ca. 3-fold more eggs on PI 134417-3 than on the cultivated tomato cv. Walter in field experiments, extensive mortality of larvae on PI 134417-3 resulted in populations of late instar larvae being significantly lower than those of ‘Walter.’ In laboratory experiments, removal of the glandular trichome tips from PI 134417-3 leaflets by swabbing with ethanol resulted in a dramatic reduction in the level of resistance, but did not render the plants as susceptible to CPB as the tomato cv. Walter.

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