Beet western yellows virus (BWYV) has an extremely wide host range and is distributed worldwide. Hosts include temperate pulses (chickpea, faba bean, lentil, field pea and vetch), pasture legumes (clover, medics and lucerne), canola and many perennial weeds. BWYV is transmitted persistently by a large number of aphid species, but it is not transmitted mechanically or through seed. It persists between crop seasons on alternate hosts such as perennial weeds, lucerne and summer brassicas. Control measures include monitoring and spraying aphids, as well as the eradication of alternate virus reservoirs such as weeds.