Resistance in Lycopersicon and Solanum to Greenhouse Whiteflies1

Abstract

Preliminary evaluations of species of Lycopersicon and Solanum for resistance to the greenhouse whitefly, Trialeurodes vaporariorum (Westwood), revealed that the heavy vesture of sticky glandular exudate on the aerial parts of S. pennellii Correll and L. hirsutum Humb. & Bonpl. is a death trap for the adults alighting upon it. However, when the foliar exudate was removed with alcohol, oviposition occurred, and young developed normally to adults. This vesture of glandular exudate is a variable character in the self-incompatible L. hirsutum ,, but it is stable and pronounced in S. pennellii .