Eleven strains of Gibberella fujikuroi mating population F and two strains of mating population A were tested for aggressiveness to grain sorghum plants grown under greenhouse conditions. All strains were tested against the cultivar Wheatland, and four strains were tested against Wheatland, SC599, B1778, and BKS45. No significant (P=0.05) differences in aggressiveness were detected. Two cultivars previously described as resistant exhibited shorter main lesions than the susceptible cultivars, but this correlation was not significant when total lesion length was used to measure aggressiveness (.)
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Douglas J. Jardine (1992) studied this question.