BYMV isolates was efficiently transmitted to some plants by rub-inoculation.
BYMV isolate from Dezful, BYMV-D1 induced chlrotic and necrotic local lesion and then systemic symptoms on some species in chenopodiacea, leguminoseae and solanaceae families.
Because of difficulties in controlling TSWV vectors and the transmission of BYMV, BCMV and CMV by aphids in a non-persistent manner, these viruses can be responsible for the loss of up to 100% of faba bean crops.
The most striking response of arrowleaf clover to infection with BYMV is a rapid, systemic wilting beginning on the youngest growth 8 to 13 d postinoculation and resulting in plant death.
The development of BYMV tolerance was demonstrated with arrowleaf families from four cycles of selection where four BYMV disease symptoms (dwarfing, rugosity, chlorosis, and mosaic) and dry matter production were evaluated.
These germplasms should be useful as sources of resistance to BYMV
for possible cultivar selection or for crossing to adapted cultivars.
Nine PI lines identified as resistant to BYMV in 1993-1994 tests were selected for polycrossing during fall 1996.
It should be useful as a source of BYMV resistance for further selection and cultivar development or for crossing with other cultivars.