Worldwide, barley yellow dwarf virus (BYDV) is the most widespread and damaging virus disease of cereals. It infects wheat, barley, oats and grasses and is transmitted by several aphid species. The virus is not seed-borne and to persist from one growing season to the next it must survive in over-summering grasses.
Barley yellow dwarf virus decreases grain yield and also causes shrivelled grain. Yield loss is greatest from infection early in the growing season.
McKirdy, Simon and Jones, Roger
"Barley yellow dwarf virus in cereals,"
Journal of the Department of Agriculture, Western Australia, Series 4: Vol. 34
, Article 2.
Available at: http://researchlibrary.agric.wa.gov.au/journal_agriculture4/vol34/iss1/2