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.
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1 April 2001
Distribution and Abundance of Insecticide Resistant Greenbugs (Homoptera: Aphididae) and Validation of a Bioassay to Assess Resistance
G. E. Wilde,
R. A. Shufran,
S. D. KINDLER,
H. L. BROOKS,
P. E. SLODERBECK
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Journal of Economic Entomology
Vol. 94 • No. 2
April 2001
Vol. 94 • No. 2
April 2001
greenbug
insecticide
resistance
sorghum
wheat