Abstract
Field evaluation of 50 (fifty) local landraces of rice against paddy yellow stem borer (YSB), Scirpophaga incertulas (Walker) was carried out at the College of Agriculture, V.C. Farm, Mandya during kharif and Summer 2022-23. The per cent of damage by YSB on different genotypes was evaluated at 30, 60 and 90 days after transplanting (DAT) in both the seasons. Based on the mean per cent incidence rice genotypes were grouped into different resistance categories. In kharif 2022, out of 50 local landraces screened ten (10) genotypes recorded resistance reaction with a damage score of 1, twenty seven (27) genotypes were found to be moderately resistant with a score of 3, nine (9) genotypes reacted as moderately susceptible with score of 5 and four genotypes showed susceptible reaction with score of 7. During summer 2023 as well, the same results were observed but the per cent incidence was varied. In both the seasons none of the genotypes were found to be highly resistant or highly susceptible to YSB. The promising resistant and moderately resistant genotypes found in the current study can be further used in resistant breeding programs.
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