title: Distribution and abundance of insecticide resistant greenbugs (Homoptera: Aphididae) and validation of a bioassay to assess resistance.
abstract: Laboratory bioassays were conducted to determine the toxicity of four insecticides (ethyl parathion, chlorpyrifos, malathion, and carbofuran) to insecticide-susceptible and resistant populations of greenbug, Schizaphis graminum (Rondani). These bioassays were used to develop and validate a discriminating concentration for assessing insecticide resistance in greenbug populations in the field. Samples from wheat and sorghum in two states, Oklahoma and Kansas, indicated that insecticide resistance persists in greenbug populations over a large area at a low level.
authors.affiliation: Department of Entomology, Kansas State University, Manhattan 66506, USA.
authors.forename: G E
authors.initials: GE
authors.lastname: Wilde
authors.forename: R A
authors.initials: RA
authors.lastname: Shufran
authors.forename: S D
authors.initials: SD
authors.lastname: Kindler
authors.forename: H L
authors.initials: HL
authors.lastname: Brooks
authors.forename: P E
authors.initials: PE
authors.lastname: Sloderbeck
mesh_terms: D000818:Animals; D001042:Aphids; D001681:Biological Assay / Q000592:standards; D002235:Carbofuran; D004390:Chlorpyrifos; D003710:Demography; D004591:Electrophoresis, Polyacrylamide Gel; D007300:Insect Control; D019476:Insect Proteins / Q000032:analysis; D007305:Insecticide Resistance; D007306:Insecticides; D008294:Malathion; D010278:Parathion; D011156:Population Density
chemical_list: D019476:Insect Proteins; D007306:Insecticides; D010278:Parathion; D004390:Chlorpyrifos; D002235:Carbofuran; D008294:Malathion