Field screening of popular rice cultivars against rice leaf folder (Cnaphalocrosis Medinalis Gunee.) incidence in north eastern coastal plains of Odisha

Abstract

Studies on the reaction of popular rice cultivars against rice leaf folder Cnaphalocrocis medinalis (Guenee) and various aspects of morphological characters of popular rice cultivars of coastal plains of Odisha together was conducted for kharif 2015-16 and 2016-17 at farmers field and Krishi Vigyan Kendra Research unit. It is one of the most serious pest in rice production. It is expensive and environmentally unsafe to manage this serious pest by using chemicals. Best approach to manage this pest is to develop host-plant resistance. Ten popular rice genotypes were screened for resistance to rice leaf folder. Varietal preference of rice leaf folder among ten popular rice varieties was analysed during kharif 2015 and 2016 at 30, 45, 60 and 75 DAT and the per cent of leaf folder damage, the varieties were given ratings according to Standard Evaluation System (IRRI)’s for rice (scale of 0-9). All the ten varieties come under two different ratings i.e., nine varieties under a rating of 3 (Moderately resistance) and one varieties under a rating of 5 (moderately susceptible). The lowest damage was recorded in PRATIKSHYA(ORS-201-5) (14.9%) followed by Pooja (15.7%), Anjana(15.9%),which was on par with Surendra (16.1),CR-1018(16.7%),CR-1009(16.7%) and MTU-1001(16.9%).The highest damage was observed in MTU-7029 (31.00%) followed by SWARNA SUB -1 (29.03%).The correlation coefficient (r) values between Morphological characters and per cent leaf damage by the rice leaf folder during 2015-2016 kharif and 2016-17 indicated that the length of the leaf did not affect the infestation of rice leaf folder significantly, but all the other factors showed significant correlation with leaf folder infestation, whereas positive significant correlation was observed with leaf width.