Introduction. Management options include: Not sowing wheat into infected stubbles. There has been little focus on management of the disease in the literature over the past twenty years, although much of the United States still suffers disease outbreaks. Barley yellow dwarf (byd) Pathogen: barley yellow dwarf virus Spread by at least 20 aphids spp. Barley yellow dwarf virus (BYDV) is an aphid-vectored, viral disease which most typically strikes small grains, especially barley, oats, and wheat. This virus is only transmitted from infected to healthy plants by aphid vectors and it has been shown that 25 species of aphids can vector it (Halbert and Voegtlin 1995). Outbreaks occasionally reach epidemic proportions, as occurred on wheat in 1987 and oats in 1988. Barley yellow dwarf (BYD) is a serious and widely occurring viral disease of cereal crops and other ... Disease cycle of barley yellow dwarf. Viral diseases 84. 2016). Yield losses of 13–45 kg ha −1 for each 1% increase in BYDV incidence are reported, and can result in a total yield reduction of 80% in wheat. Yellow leaf spot is most severe where successive wheat crops are grown on retained stubble. Wheat is a natural host for many viruses. Systemic, insecticide seed treatments can be incorporated to reduce the number of aphids in the field. Clonal populations of the aphid, Schizaphis graminum, have been separated into biotypes based on host preference and their ability to overcome resistance genes in wheat.Recently, several biotypes were found to differ in their ability to transmit one or more of the viruses that cause barley yellow dwarf disease in grain crops, and vector competence was linked to host preference. Brunt et al. Rotating wheat with barley, oats or a non cereal crop will reduce the impact of this disease. Barley yellow dwarf virus (BYDV) is a member of the luteovirus group. Yellow dwarf (YD) has been reported worldwide and is considered a serious disease of wheat ().The causal pathogens of yellow dwarf are viruses from the family Luteoviridae, including Barley yellow dwarf virus (BYDV) and Cereal yellow dwarf virus (CYDV). Barley Yellow Dwarf Virus (BYDV) Since the mid-1980s, barley yellow dwarf has become increasingly widespread in the USA and is now of serious concern to oat and wheat producers. Barley yellow dwarf luteoviruses and other virus diseases M. Henry, R.T. Plumb. Foliar fungicides are registered to control yellow leaf spot, but they may not be economical. Barley (Hordeum vulgare L.) is considered the fourth most important cereal crop in the world after wheat, corn, and rice, with nutritional benefits for both livestock and humans (Elke and Emanuele 2013).Barley is a member of the grass family and is one of the eight founder crops (einkorn wheat, emmer wheat, barley, lentil, pea, chickpea, bitter vetch, and flax) (Lakshmi et al. Barley yellow dwarf virus-PAV (BYDV-PAV) is associated with yellow dwarf disease, one of the most economically important diseases of cereals worldwide.In this study, the impact of current and future predicted temperatures for the Wimmera wheat growing district in Victoria, Australia on the titre of BYDV-PAV in wheat was investigated.