Abstract

Seventy four rice cultures developed in TNAU rice research centres were screened for resistance to yellow stem borer under field condition during Rabi, 2011 - 2012. The genotype CB 08504 had the lowest dead heart incidence (1.48%) with the resistan ce rating of 1 (resistant). It was followed by TM 08610 (4.65%) and CB 06651 (5.10%). Grain yields recorded under protected condition for CB 08504, TM 08610 and CB 06651 were 6389, 6325 and 6244 kg/ha respectively. With regard to white ear incidence, AD 08142 had the lowest incidence of 1.25 per cent and significantly differed from all other cultures, followed by ADT (R) 46 and TNRH 206 which recorded 5.40 and 5.62 per cent white ear respectively. Under protected condition AD 08142, ADT (R) 46 and TNRH 206 recorded the grain yields of 6875, 5205 and 8275 kg/ha, respectively. At both vegetative and reproductive crop phases, AD 08142 and ADT (R) 46 recorded the scale of 1 (resistant). AD 08142, CB 08504, TM 08610, CB 06651 and TNRH 206 (hybrid) can be promoted as they have yellow stem borer resistance in addition to good yield.

Keywords: Yellow stem borer, rice genotypes, resistance, dead heart, white ear, grain yield