Effect of sowing date on incidence of Sudanese broad bean mosaic virus in, and yield of, Vicia faba.
Delaying the sowing of irrigated field beans (Vicia faba) in the Sudan after October greatly lowered the yield of seed and increased both infestation by aphids and the incidence of a sap-transmissible virus here termed Sudanese broad-bean mosaic virus (SBBMV). This had first been observed in 1968 at Hudeiba and caused mild chlorosis and vein-clearing, which later developed into mottling. Yield/plant was positively correlated with number of pods, but negatively correlated with the percentage infection with SBBMV. In greenhouse conditions, SBBMV was readily acquired from diseased plants and transmitted to healthy plants in 5-min feeding periods by both Aphis craccivora Koch and Acyrthosiphon sesbaniae David.,