title: Olfactory discrimination byHeteropsylla cubana (Homoptera: Psyllidae) between susceptible and resistant species ofLeucaena (Leguminosae).
abstract: In the field, adult psyllids,Heteropsylla cubana Crawford, oriented significantly more towards the caged seedlings of susceptibleLeucaena leucocephala (Lam.) de Wit than to those of the resistant tree species,Leucaena collinsii Britton & Rose, or the nonhostAmaranthus spinosus L. In a dual-choice bioassay using a still-air olfactometer, the females demonstrated a strong positive response to the hexane extract ofL. leucocephala leaves at 1×10(-3) g equivalents (g eq) of leaf material. The females did not orient to leaf extracts ofL. collinsii at high concentrations but responded positively at a lower concentration of 1×10(-4) g eq. Olfactory discrimination byH. cubana between resistant and susceptible host species should be considered in selection and breeding programs.
authors.affiliation: Centre for Pest Management Department of Biological Sciences, Simon Fraser University, V5A 1S6, Burnaby, British Columbia, Canada.
authors.forename: E B
authors.initials: EB
authors.lastname: Lapis
authors.forename: J H
authors.initials: JH
authors.lastname: Borden