Abstract
Spot blotch and common root rot, caused by the fungal pathogen Cochliobolus sativus, are important barley diseases in many production areas of the world. The interrelationship between these two diseases was investigated in a series of controlled environment studies. Strong correlations were detected for barley reactions to both diseases. Large differences in disease reactions were observed among genotypes for each disease. No genotype was immune to both diseases, but the genotype WI 2291 was universally susceptible. Our results suggest that resistance to C. sativus in the subcrown internodes and leaves involve similar defence mechanisms. Such information would be useful to plant breeders because testing for spot blotch reaction requires less time than screening for common root rot resistance.
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