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Behavioral studies have shown that aphid resistance in Lycopersicon pennellii (Corr.) D'Arcy is due to the presence of sugar esters in glandular exudate of the type IV trichomes. In this study, various methods for the estimation of epicuticular sugar ester concentrations were examined. There was a significant negative relationship between the concentration of sugar esters on the leaf and the level of potato aphid infestation in a segregating L. esculentum × L. pannellii F2 population. Selection for sugar ester accumulation should be an efficient selection technique for the aphid resistance of L. pennellii and other species that synthesize epicuticular sugar esters. The wild Peruvian tomato species (Lycopersicon pennellii (Corr.) D'Arcy) is a potential source of resistance to insects and other phytophagous pests of the cultivated tomato (L. esculen- tum Mill.) (de Ponti et al., 1975; Georgia and Sotirova, 1978; Gentile and Stoner, 1968a, 1968b; Gentile et al., 1968; Gentile et al., 1969; Goffreda et al., 1988; Juvik et al., 1982), Potato aphid (Macrosiphum euphorbiae Thomas) resistance in L. pen- nellii is related to the presence of glucose esters in type IV trichome exudate (Goffreda, 1988; Goffreda et al., 1989). The 2,3,4-tri-O-acylglucoses of L. pennellii are composed of C 4 to Cl2 fatty acids, including 2-methylpropanoic, 2-methylbutan - oic, 3-methylbutanoic, 8-methylnonano ic, n-decanoic, and n- dodecanoic acids (Burke et al., 1987). In laboratory bioassays, purified glucose esters significantly deter aphid settling at con- centrations as low as 25 µg·cm -2 ; at concentrations of 100 µm·cm -2

Association of Epicuticular Sugars with Aphid Resistance in Hybrids with Wild Tomato