Variation of Transmission Potential of BYDV by Rhopalosiphum padi
Abstract: Through sereral years of experiments and researches it is shown that the transmission potential of BYDV by Rhopalosiphura padi has been drastically enhanced, This fact enabled the expansion and development of this disease from the arid and semiarid areas in the north toward the more fertile wheat field at the irrigated areas and even toward the wheat areas in the south. In 1988 and 1989 it has been successively induced the prevalence of BYDV at western Guanzhong of Shanxi Province and in spring of 1989 at R...