title: Aphid feeding deterrents in sorghum : Bioassay isolation and characterization.
abstract: Improvements in a synthetic diet for use in a bioassay to screen for feeding deterrents againstSchizaphis graminum, greenbug, are reported. Feeding on the synthetic diet was highly pH dependent with maximum feeding occurring at about pH 8.0. The bioassay was used as a guide in the isolation of feeding deterrent substances from aphid-resistant lines of sorghum (Sorghum bicolor). The major greenbug feeding deterrents isolated from sorghum leaves wereP-hydroxybenzaldehyde (ED50 0.13%), dhurrin (ED50 0.16%), and procyanidin (ED50 0.08%).
authors.affiliation: U.S. Department of Agriculture Science and Education Administration, Western Regional Research Center, Berkeley, California.
authors.forename: D L
authors.initials: DL
authors.lastname: Dreyer
authors.forename: J C
authors.initials: JC
authors.lastname: Reese
authors.forename: K C
authors.initials: KC
authors.lastname: Jones