SUCROSE ESTERS OF CARBOXYLIC-ACIDS IN GLANDULAR TRICHOMES OF SOLANUM-BERTHAULTII DETER SETTLING AND PROBING BY GREEN PEACH APHID

Removal of type B trichome exudate from Solanum berthaultii leaflets leads to a decrease in tarsal gumming and mortality and an increase in feeding by the green peach aphid, Myzus persicae. Type B trichome exudate of the S. berthaultii accession PI 473331 is composed of a complex of 3′,3,4,6-tetra-O-acyl sucroses containing primarily short-chain branched carboxylic acids. The acyl constituents are primarily derived from 2-methylpropanoic, 2-methylbutyric, and 8-methylnonanoic acids but constituents derived from n-decanoic and dodecanoic acids are also present. Sucrose esters inhibit settling and probing by aphids in glass feeding cages. © 1990 Plenum Publishing Corporation.