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Strains of Rice Tungro Virus. A. Anjaneyulu, Assistant Virologist, All-India Coordinated Rice Improvement Project, Rajendranagar, Hyderabad-30, India, Present address of senior author: Central Rice Research Institute, Cuttack-6, India; V. T. John, Virologist, All-India Coordinated Rice Improvement Project, Rajendranagar, Hyderabad-30, India. Phytopathology 62:1116-1119. Accepted for publication 4 April 1972. DOI: 10.1094/Phyto-62-1116.

Symptomatology, transmission, varietal reaction, and cross-protection tests of four distinct isolates of rice tungro virus collected from various parts of India were studied. Four strains of rice tungro virus designated RTV₁, RTV_2A, RTV_2B, and RTV₃ were identified. RTV₁ produced mild symptoms on Taichung (Native) 1, and did not infect any one of the six differential cultivars tested. RTV_2A and RTV_2B were indistinguishable on Taichung (Native) 1, on which they produced severe symptoms. RTV_2A infected Pankhari 203, Kamod 253, Ambemohar 159, and Ambemohar 102, and produced severe symptoms. RTV_2B infected Latisail, Pankhari 203, and Ambemohar 159, and produced mild symptoms. Kamod 253 and Ambemohar 102 were susceptible to RTV_2A but resistant to RTV_2B. RTV₃ produced severe symptoms on Taichung (Native) 1 in the initial stages, but the infected plant soon recovered and produced green leaves. This strain also infected five out of six differential cultivars. Kataribhog was resistant to all the four strains.