Screening of advanced rice cultures against stem borer, Scirpophaga incertulas (Walker) and leaf folder, Cnaphalocrocis medinalis (Guenee)

Abstract

The different rice cultures were screened against stem borer, leaf folder of rice during kharif 2017 and 2018 at Agricultural Research Station, Nellore, Andhra Pradesh. An experiment was carried out to note the reaction of 28 promising advanced rice cultures with the susceptible check variety TN 1 against stem borer and leaf folder of rice with a view to identify resistant sources. Rice cultures were evaluated based on the Standard Evaluation System with a scale of 0-9. Among 28 rice advanced rice cultures screened against stem borer, nine cultures were found to be highly resistant to stem borer with nil dead heart incidence at 30 DAT during kharif, 2018. Eighteen cultures were resistant to stem borer with per cent dead hearts ranged from 1.5 to 10.14% at 50 DAT during kharif, 2017. The rice culture NLR 3542 recorded resistant reaction against leaf folder by recording 8.68 and 4.80% leaf damage during kharif 2017 and 2018, respectively with a grade 1.