Crown rust on oat genotypes with different levels of resistance: damages and losses

ABSTRACT: The evolution in virulence of Puccinia coronata f. sp. avenae has challenged the genetic resistance to crown rust oat genotypes. New sources are constantly required for yield stabilization and costs reduction. This study aimed characterize genotypes disease´s productive economic impact. Experiments were conducted two environments, with without chemical control. Resistance was measured by disease progress, apparent rate infection, final severity pustule size. Damages based on reduction yield, 1000 grain mass hectoliter mass. UFRGS16Q6030-2 immune. In both UFRGS166091-2 URS Brava exhibited greatest level smallest reduction, while 22 highly susceptible, reducing more than 70% its yield. These results surpass negative impacts previously reported oats, particularly related data presented this paper highlighted importance resistance, partial maintaining potential, environmental contamination less fungicides, increasing gains cultivation.