Response of Dry Bean Selections to Field Infestations of Seedcorn Maggot in Central Washington13

Abstract

Field comparisons of 64 and 96 selections of beans, Phaseolus vulgaris L., for response to seedcorn maggot (SCM), Hylemya platura (Meigen), were conducted in 1978 and 1979, respectively. Black, red, pink, pinto, and certain white beans produced good stands despite severe infestation of SCM, but none were so resistant that they did not benefit from the protection provided by seed treatment with chlorpyrifos. The treatment even appeared to give complete protection to beans that were most sensitive to SCM attack. Selections most resistant to SCM in both years were black, dark red kidney, and pink types, and significant differences among these genotypes were few. Most white beans were severely damaged, but the class showed the greatest range in resistance to SCM.