Greenbug resistance to registered insecticides can cause problems for small grain producers and could be carried over to greenbug management issues in sorghum. A few fields where control problems were observed have been tested using a method developed by Ed Bynum (E. D. Bynum, JR. and T. L. Archer, 2000. Identifying Insecticide-Resistant Greenbugs (Homoptera: Aphididae) with Diagnostic Assay Tests, J. Econ. Entomol. 93(4):1286Ð1292 (2000)). This testing confirmed clorpyrophos resistant greenbugs in isolated spots.
Surveys in 1990 in High Plains sorghum found insecticide-resistant greenbugs in most counties north of Amarillo. Resistant greenbugs will continue to develop and reproduce after an insecticide treatment; their reproductive potential is extremely high. Every effort should be made to apply insecticide only to fields where economic thresholds have been exceeded to reduce the rate of selection for insecticide- resistant greenbugs and reduced rates should not be used.
No comments:
Post a Comment