Physical Screening of Resistance on Selected Rice Accessions against Rice Leaf Folder – Cnaphalocrocis medinalis Guenee (Pyralidae: Lepidoptera) under Screen House Condition

The experiment was carried out at screen house III, Department of Entomology, Faculty of Agriculture, Annamalai University, Chidambaram. India. Total 13 numbers of rice accessions were concerned along with one susceptible check (TN-1) to picked up to quantify the most prominent resistant accessions on different selected rice genotypes by showing their resistance characters against the rice leaf folder, Cnaphalocrocis medinalis during Kharif 2022. Among which, based on the morphological traits viz., plant height, length and width of flag leaves, productive tiller numbers, peduncle length, panicle length and trichome density, only one accession (BA-207) was recorded as highly resistant and five (BA-18, BA-31, BA-187, BA-193 and BA-266) of them were reported as resistant accessions. The observations were made at 60 days after transplanting. All the results are given based on the standard evaluation system (SES) build up by International Rice Research Institute. Three of accessions exhibit moderate resistance viz., BA-30, BA-116 and BA-243. Three numbers of accessions were noted as moderately susceptible, which are BA-5, BA-80 and BA-91. At the same time, TN-1 was noticed as highly susceptible. A detailed report given in this research article is based on 13 rice accessions that were tested under screen house conditions. In the farmers point of view, susceptible varieties should replaced with resistant accessions to decrease the pest incidence and enhance the grain productions