品北农林升枚大学 2.Distribution NORTHW国图T A&F UNIV到RsIT型 Macrosiphum avenae:All of the wheat growing areas in China;are the most destructive species of aphids. Schizaphis graminum:Distributed in northern areas,especially in Huabei and northwestern China. Rhopalosiphum padi:Dominant species in rainy and moist wheat growing areas. 8888Macrosiphum avenae: All of the wheat growing areas in China; are the most destructive species of aphids. Schizaphis graminum: Distributed in northern areas, especially in Huabei and northwestern China. Rhopalosiphum padi: Dominant species in rainy and moist wheat growing areas. 2. Distribution