Evaluation of rice varieties for tungro resistance by field screening techniques

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Abstract
Field screening techniques, i.e., the Nursery screening method, Field screening method and Field evaluation trial, to evaluate germplasm collections, high yielding semi‐dwarf cultivars and experimental cultures against rice tungro virus disease have been developed after a careful consideration of factors favouring tungro outbreaks. These methods along with scoring systems are described and discussed. Out of 6650 germplasm collections screened by the above methods 78 were identified as tungro resistant. Of these, 43 varieties did not show any visual symptoms (0% infection), while a susceptible control showed 100% infection. Ninety one commercially released high yielding semi‐dwarf rice cultivars were tested by the Field evaluation trial and eight were identified as resistant, 27 as intermediate and 55 as susceptible. The resistant cultivars were Annapurna, IR 20, IR 30, Pragati, Pusa 2–21, Pusa 33, Sugdass and Triveni. Out of 5600 experimental cultures evaluated by the Field screening method and Field evaluation trial, 105 were identified as resistant, of which 38 had a high degree of resistance.

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