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Rice blast disease caused by  Pyricularia oryzae  Cavara (Teleomorph:  Magnaporthe oryzae  B.C. Couch) is one of the main pathological threats to rice crop around the world. Here, 72 monogenic isolates obtained from blast-infected rice samples from the principal rice growing districts of Karnataka, India were screened for virulence. Further, 16 highly virulent isolates were tested on the 24 international differential cultivars targeting 16 resistance genes. Eight differentials were used to determine the races of these fungal isolates. A total of 15 pathotypes were detected among 16 isolates. Differential variety, namely Raminad str 3 showed the maximum resistance followed by Zenith and NP125 with  Pia  and  Pik  resistance genes, respectively. This study has revealed the race types and corresponding resistance genes through the infection studies carried on the differentials will help the breeders to incorporate these resistant genes into the local cultivars through MAB to develop blast-resistant cultivars.

Evaluation of virulence and race identification of rice-blast fungus Pyricularia oryzae isolated from different districts of Karnataka, India