BAINS, S. S.GREWAL, TARLOCHAN SINGH2020-01-242020-01-241975http://krishikosh.egranth.ac.in/handle/1/581014199031052017_0002_0015_001561.pdfENGLISHECOLOGICAL STUDIES ON THE WHEAT APHIDS (APHIDIDAS : HOMOPTERA)Thesis