Abstract
Barley yellow dwarf virus (BYDV) content in extracts from cereals grown in the greenhouse, growth chamber or field was measured by enzyme-linked immunosorbent assay. The results showed that, for some of the virus/host combinations tested, symptomatic resistance to BYDV as previously determined by plant breeders was associated with reduced virus productivity in infected plants. Although this effect was cultivar-specific and virus isolate-specific, it could be a valuable adjunct in breeding for BYDV resistance and management in cereals and deserves more extensive investigation. Suggested procedures for this are outlined.