BALIKAI, R. A.GIRISH, V. P.2019-01-312019-01-312015-06http://krishikosh.egranth.ac.in/handle/1/5810093031Studies on impact of weather parameters on insect pests of paddy and their management were under taken at the ARS, Sirsi (Uttara Kannada district); Department of Agricultural Entomology and Institute of Agricultural Biotechnology, UAS, Dharwad during 2013-15. The prediction model developed for paddy hoppers [Y= -11.094+3.561(sunshine hours)] can forecast hopper population at 4 weeks before upto 53.50 per cent accuracy. Forecasting model developed for yellow stem borer [Y= 0.013+0.059 (rainfall)] can forecast at one week prior with accuracy of 58.60 per cent. Similarly, prediction model developed for ear head bug [Y= 127.327-5.706 (Tmin.) -0.181 (rainfall)] can predict its population at four week lead time with accuracy of 57.60 per cent. Twenty nine genotypes exhibited multiple pest resistance to three pests (leaf folder, stem borer and ear head bug); 37 genotypes to two pests (stem borer and ear head bug); three genotypes to two pests (leaf folder and stem borer) and one genotype to two pests (leaf folder and ear head bug). Genotypes, GGV-0501, Siri-1253, Antarsali, MGD-105 and Prasanna recorded highest grain yield in addition to resistance to three pests. There was non-significant positive correlation between leaf folder, stem borer and ear head bug incidence and biochemical constituent like nitrogen; and negative correlation with phosphorous, potash, silica, zinc and total phenol. Mandya population of BPH formed a distinct cluster being genetically more diverse compared to other locations population. Raichur and Koppal populations showed highest similarity value of 0.76 degree. Emamectin benzoate 5 SG @ 0.25 g/l, flubendiamide 480 SC @ 0.1 ml/l and spinosad 45 SC @ 0.2 ml/l were found very effective against leaf folder and recorded highest grain yield and benefit cost ratio, whereas fipronil 5 SC @ 2 ml/l, chlorfenapyr 2 SC @ 2 ml/l, thiachloprid 240 SC @ 0.25 ml/l proved excellent against yellow stem borer. Thiamethoxam 25 WG @ 0.3 g/l and malathion 5 D @ 20 kg/ha were effective against earhead bug. Buprofezin 25 SC @1.0 ml/l and acephate 75 SP @ 1 g/l proved very effective against paddy hoppers.ennullThesis