Screening of the recent rice varieties against leaf folder, Cnaphalocrocis medinalis Guenee (Pyralidae: Lepidoptera)

Abstract

Studies on the response of twenty one rice varieties against rice leaf folder Cnaphalocrocis medinalis (Guenee) were conducted during kharif 2015 at the Agricultural college farm, Bapatla, Andhra Pradesh. The cumulative mean percent of leaf folder damage in twenty one rice varieties indicated that the lowest leaf damage was recorded in BPT-2231 (7.10%) and the highest damage was observed in BPT-5204 (18.20%) followed by BPT-2570 (16.90%). According to International Rice Research Institute (IRRI), Standard Evaluation System (SES) the ratings were given to the varieties against leaf folder damage. The varieties were categorized into ten resistant (under a rating of ‘1’) eleven moderately resistant (under a rating of ‘3’). Highly resistant (under a rating of ‘0’) and highly susceptible (under a rating of ‘9’) varieties were not recorded.