Author(s):

Elanchezhyan K, Arumugachamy S

Abstract: A total of 15 medium duration rice genotypes with four check entries were screened against rice leaffolder, Cnaphalocrocis medinalis (Guenee) at Rice Research Station (TNAU), Ambasamudram during Pishanam season, 2013-14. Genotypes were evaluated based on the standard evaluation system for rice with a scale of 0 - 9. The leaffolder infestation varied from 3.76 to 52.13 % of leaf damage in rice. The genotype AS 12079 recorded resistant reaction by recording less than 10% leaf damage (3.76%) with a grade 1. Nine genotypes viz., AS 12005, AS 12010, AS 12029, AS 12035, AS 12039, AS 12050, AS 12066, AS 12073 and ASRH 12001 reacted moderately resistant (11 - 20% leaf damage) to leaffolder with a grade of 3. Three rice genotypes viz., AS 12033, AS 12071, AS 12104 were moderately susceptible reaction by recording less than 35% leaf damage (Grade 5) and one genotype AS 12051 expressed susceptible reaction by recording a leaf damage of 36.24% with a grade 7. The highly susceptible genotype AS 12008 recorded the maximum infestation of 52.13 per cent leaf damage (Grade 9). None of the genotypes were free from leaf damage to be categorized as highly resistant (0% leaf damage).

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