作者单位:Department of Soil, Crop, and Environmental Sciences, University of Arkansas, Fayetteville, AR 72701[1]Department of Plant Pathology, University of Arkansas, Fayetteville, AR 72701[2]University of Arkansas Southwest Research and Extension Center, 362 Highway 174 North, Hope, AR 71801[3]USDA-ARS Dale Bumpers National Rice Research Center, 2890 Highway130 East, Stuttgart, AR 72160[4]