Intraspecific variations for transmission of BYDV-PAV and -MAV isolates by the aphids Sitobion avenae and Rhopalosiphum padi E. Sadeghi, CA Dedryver, S. Tanguy and G. Riault Agronomie, 15 7-8 (1995) 504-505 DOI: 10.1051/agro:19950740