Severe spot blotch infection was observed in 1990 on several two-row barley breeding lines previously regarded as resistant to
Cochliobolus sativus. Studies were conducted to compare the virulence pattern of a C. sativus isolate (ND90Pr) obtained from
this two-row breeding nursery with one (ND85F) used in previous disease screening evaluations. Greenhouse and field experiments
were performed in 1991 and 1992 at Fargo, ND, using a split plot design with isolate as the main effect. Isolates ND90Pr
and ND85F exhibited distinct differential virulence patterns on barley genotypes ND 5883, ND 12437, ND 12720, ND 12721,
and Bowman. Isolate ND90Pr displayed high virulence on ND 12720, ND 12721, and Bowman, and low virulence on ND 5883
and ND 12437. In contrast, isolate ND85F was highly virulent on ND 5883 and ND 12437 and weakly virulent on ND 12720,
ND 12721, and Bowman. Both isolates expressed low virulence on genotype ND Bl 12, the primary source of resistance to C.
sativus in commercial six-row barley germplasm. To incorporate adequate levels of resistance into future two-row barley cultivars,
disease evaluations should be made with C. sativus isolates that express the full spectrum of virulence found in North
Fetch, T., & Steffenson, B. (1994). Identification of Cochliobolus sativus isolates expressing differential virulence on two-row barley genotypes from North Dakota. Canadian Journal of Plant Pathology. Revue Canadienne De Phytopathologie., 16(3), 202-206.
Canadian Journal of Plant Pathology website: http://www.tandfonline.com/loi/tcjp20
Fetch Jr, T.G.; Steffenson, Brian.
Identification of Cochliobolus sativus isolates expressing differential virulence on two-rowed barley genotypes from North Dakota.
Canadian Journal of Plant Pathology.
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