proceedings of the international workshop, July 6-11, 1987, Udine Italy Burnett, P. A. International Maize and Wheat Improvement Center Italy text Mexico, D.F., Mexico CIMMYT 1990 monographic xvi, 511 p. : ill., maps ; 25 cm. "Sponsored by: Dipartimento cooperazione allo sviluppo, International Maize and Wheat Improvement Center." Barley yellow dwarf disease Barley yellow dwarf viruses Grain 633 CIM 1990 Or. 9686127399