Influence of propagation on incidence of seedborne bean common mosaic virus in the USDA Phaseolus germ plasm collection.

In most accessions, seedborne BCMV incidence was reduced to a level that would allow BCMV eradication by elimination of infected plants without affecting genetic diversity. BCMV spread occurred during the July through December greenhouse increase and in the summer field increase, but no significant change in average seedborne BCMV incidence was detected in the 32 and 42 accessions examined, respectively. Virus spread appeared to be caused by noncolonizing aphids. In the absence of effective vector control, average seedborne BCMV incidence in the P. vulgaris germ plasm collection has apparently reached an equilibrium at about 7%