Assessment of yield losses of rice caused by paddyleaf folder, Cnaphalocrocis medinalis Guenee

Abstract

Six genotypes viz., Palam Basmati-1, Palam Red Rice, HPR 1068, Arize 6129, HPR 2143 and Kasturi Basmati were evaluated to assess the crop/ yield losses by paddy leaf folder, Cnaphalocrocis medinalis at CSK Himachal Pradesh Krishi Vishvidyalaya, Rice and Wheat Research Centre, Malan, during Kharif 2012. The leaf infestation (47.1%) at maturity stage was significantly lower in HPR 2143 as compared to other varieties. However, Kasturi Basmati was having significantly higher leaf infestation (77.2%) as compared to Arize 6129 (59.2%), HPR 1068 (57.7%), Palam Red Rice (57.0%) and HPR 2143 (47.1%) and was found at par with Palam Basmati-1 (73.3%).Yield data revealed that the grain yield was higher in protected plots as compared to unprotected plots irrespective of the varieties. The highest grain yield was recorded in protected plots of Arize 6129 (76.45 q/ha) followed by Kasturi Basmati (59.07 q/ha), HPR 1068 (57.15 q/ha), Palam Basmati-1 (56.52 q/ha), HPR 2143 (52.84 q/ha) and Palam Red Rice (46.22 q/ha). The grain yield varied from 35.26 to 53.40 q/ha in the unprotected plots. Assessment of yield losses revealed that the maximum per cent avoidable losses was found in Kasturi Basmati (37.9%) and least in HPR 2143 (11.9%).