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Evaluation of rice cultivars for tungro resistance by field screening techniques


, : Evaluation of rice cultivars for tungro resistance by field screening techniques. Tropical Pest Management 28(2): 147-155

Field screening techniques, i.e., the nursery screening method, field screening method and field evaluation trial, to evaluate germ plasm collections, high yielding semi-dwarf cultivars and experimental cultures against rice tungro virus disease were developed after a careful consideration of factors favoring tungro outbreaks. These methods along with scoring systems are described and discussed. Of 5650 germ plasm 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 8 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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