The aim of this study was to determine the different levels of resistance to crown rust of oat genotypes, and to evaluate its effects on yield components. The experiments were carried out at the agronomy experimental station of the Universidade Federal do Rio Grande do Sul, in Rio Grande do Sul, Brazil, in 1995 and 1996. Ten genotypes with differentiated reactions to the disease were evaluated. Crown rust caused damage to grain yield, in different crop densities, and grain weight was the most affected yield component. However, some genotypes like UFRGS 910906 were not affected even at intermediate levels of the disease, showing thereby the possibility to combine partial resistance and yield potential in the same genotype.
Avena sativa; Puccinia coronata; grain yield; disease level
