Leaf parameters responsible for imparting resistance to rice leaffolder, Cnaphalocrocis medinalis in landraces from North-East India
Keywords:Rice, leaffolder, North- East landraces, leaf length, leaf width, trichomes
AbstractRice (Oryza sativa L.) is one of the predominant food crops of the world and is the staple food for more thanÂ two billion people in the developing countries. Among the foliage feeding pests, leaf folder, CnaphalocrocisÂ medinalis is the most prevalent causing huge loss to the rice crop during both vegetative and reproductiveÂ stages. Leaf parameters like leaf length, leaf width and trichome density was measured in twenty threeÂ landraces screened against rice leaffolder during 2015 and 2016 kharif seasons. The leaf damaged areaÂ ranged between 81.6 and 286.9 mm2 in pooled analysis data of both the seasons. Out of 23 landraces,Â seven were identified as moderately resistant to rice leaffolder. Leaf length varied from 36.33 to 58.00 cmÂ and leaf width ranged between 0.77 and 1.55 cm in both the seasons. Trichome density varied from 0.00 toÂ 305.00 in different landraces. Pearson correlation co-efficients between leaffolder damage area and leafÂ parameters revealed a significant negative correlation with leaf length (r = - 0.7504) and a significantÂ positive correlation with respect to leaf width (r = 0.8741). However, presence or absence of trichomes andÂ their density did not show any relation with respect to leaffolder damage.
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