Abstract
The Ethiopian barley line C.I. 5791, and six hybrids from crosses between this line and commercial cultivars, were tested in growth cabinets for their reaction to barley yellow dwarf virus (BYDV) isolates 6409 (Macrosiphum avenae-specific) and 6515 (nonspecific). C.I. 5791 was highly tolerant to both isolates. Two hybrids, 62-528 and 65-407-3, were highly tolerant to isolates 6409 and 6515, respectively. Herta, included as a susceptible cultivar, showed the least tolerance to each virus isolate. When these two hybrids were tested against BYDV isolates 6524 (Rhopalosiphum padi-specific) and 6716 (R. maidis-specific), tolerance was higher when plants were inoculated at the four- to five-leaf stage than at the two-leaf stage. Tolerance to isolate 6716, characterized as mild on susceptible oats, was lower than to isolate 6524, which was moderately severe on the oats. Tolerance to the four virus isolates was generally highest for hybrid 62-528.
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