The objective of this study was to evaluate the levels of resistance to Myzus persicae of tomato genotypes with high leaf levels of three different allelochemicals. Three tests of resistance were performed, one for antibiosis and two for non-preference, one with winged aphids and another with apterous aphids. The tomato genotypes tested were acylsugar-rich lines TOM-687 and TOM-688; zingiberene-rich lines zgb-703 and ZGB-704; 2-tridecanone-rich lines BPX-365G-899-07-04-02 and BPX-367E-238-02, and the commercial hybrid checks Debora Max and Bravo F1, both with low contents of all three allelochemicals. There was an increase in the nymphal period of insects raised on the high-acylsugar genotypes, and shorter reproductive period, shorter longevity, and lower nymph production in genotypes with either high-acylsugars or high 2-tridecanone. Non-preference tests with both winged and apterous aphids indicated non-significant differences among the genotypes tested. The results indicate that genotypes with high contents of either 2-tridecanone or acylsugars possess levels of resistance type antibiosis to M. persicae.
Solanum lycopersicum; Insecta; plant breeding; allomones
