Abstract
Individual studies were done to estimate yield loss due to Puccinia coronata f. sp. avenae (crown rust) in the presence or absence of barley yellow dwarf virus (BYDV-PAV-IL) for two spring oat cultivars at two locations. Crown rust disease severity was assessed several times and related to yield and yield components. Linear critical point regression models were developed with analysis of covariance. Yield loss for each percent increase in crown rust severity (modified Cobb scale A) was 56,7 kg/ha for cv. Noble and 46.0 kg/ha for cv. Ogle. Test weight decrease for each percent increase in crown rust severity was 1.2 kg/m 3 for Noble and 1.1 kg/m 3 for Ogle. Ogle exhibited tolerance to yield loss from crown rust [...]
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