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Identification of Pathogenic Races of Pyricularia oryzae in India. S. Y. Padmanabhan, Director, Central Rice Research Institute, Cuttack, India; N. K. Chakrabarti(2), S. C. Mathur(3), and J. Veeraraghavan(4). (2)(3)(4)Mycologist, and Plant Pathologists, respectively, Central Rice Research Institute, Cuttack, India. Phytopathology 60:1574-1577. Accepted for publication 1 June 1970. DOI: 10.1094/Phyto-60-1574.

One hundred thirty-two isolates of Pyricularia oryzae obtained from blast-infected rice samples from the principal rice-growing states of India were tested on the international set of eight differential rice cultivars. Thirty-one races of the fungus were determined, 21 of which were new. The races belong to the international race groups IA, IC, ID, IE, IF, and a new race group designated as IJ. All the eight differentials were resistant or moderately resistant to this isolate, but other cultivars, including Yakeiko and Aichi-Asahi, were susceptible. The most prevalent races in India were IC 3 and ID 1. The cultivars Zenith, Te-tep, and Tadukan were resistant to all races so far identified in India.