Ecology, Environment and Conservation Paper

EVALUATION OF LONG DURATION PROMISING RICE GENOTYPESFOR RESISTANCE TO STEM BORER, SCIRPOPHAGAINCERTULAS(WALKER) AND GALL MIDGE, ORSEOLIA ORYZAE (WOOD-MASON)

Paramasiva, Ch Sreelakshmi, U. Vineetha and P. Rajasekhar

Abstract

Field evaluation of sixteen promising rice genotypes under natural infestation of stem borer and gall midgewas carried out at Agricultural Research Station, Nellore, Andhra Pradesh over two consecutive yearsduring kharif season. The results revealed that out of 16 genotypes screened, NLR 3763 during 2019-20 andNLR 3747 and NLR 3742 during 2020-21 recorded highly resistant reaction to stem borer with nil deadheart incidence at 30 DAT. Six rice genotypes viz., NLR 3745, NLR 3749, NLR 3750 NLR 3753, NLR 3762and NLR 3765 consistently reported resistant reaction (Scale 1) to stem borer during two years of study andat 30 and 50 DAT with dead heart incidence less than 10 per cent. Regarding gall midge although fivegenotypes viz., NLR 3744, NLR 3747, NLR 3748, NLR 3749 and NLR 3753 at 30 DAT and one genotypeNLR 3750 at 50 DAT found highly resistant (score 0) with nil gall midge incidence during 2019-20 theirexpression was not consistent. The genotypes NLR 3752, NLR 3753, NLR 3763, NLR 3762, NLR 3760 andNLR 3765 showed consistent results with moderately resistant reaction to gall midge during two years ofstudy period at 30 DAT. More over NLR 3753 consistently reported highly resistance reaction at 30 DATand became moderately resistant at 50 DAT during two years of study.