RAMA RAO, C.V.DEEKSHITA, KONCHADA2018-05-072018-05-072016http://krishikosh.egranth.ac.in/handle/1/5810044771D5271A field experiment entitled “Screening of Paddy Advanced Cultures against Brown Planthopper, Nilaparvata lugens (Stal.) and its Management with New Insecticide Molecules” was conducted at Agricultural College Farm, Bapatla during kharif 2015. Twenty eight paddy advanced cultures were screened against brown planthopper, N. lugens and the efficacy of certain new insecticides were evaluated. Out of 28 cultures screened for resistance against BPH, four cultures viz., BPT 2789, BPT 2703, BPT 2787 and BPT 2688 with 9.11, 9.59, 9.74 and 9.76 mean population per hill respectively were found resistant with a damage score of three. All other 24 genotypes were rated as moderately resistant with a damage score of five. Management of brown planthopper with certain newer insecticides revealed that all the insecticide treatments were found superior over untreated control. Amongst them, pymetrozine 50 WG @ 0.5 g l-1, dinotefuran 20 SG @ 0.4 g l-1, sulfoxaflor 25 SC @ 0.75 ml l-1 were the most effective insecticide with 62.98, 59.60 and 51.99 per cent population reduction over untreated control respectively. Among the insecticides tested for safety on natural enemies, pymetrozine 50 WG @ 0.5 g l-1 proved to be safer to the green mirid bugs with lowest mortality of 16.96 per cent reduction over precount. The impact of new insecticide molecules on spiders were also tested, where in sulfoxaflor 25 SC 0.75 ml l-1 recorded lowest mortality of 20.40 per cent followed by pymetrozine 50 WG @ 0.5 g l-1 with 23.89 per cent reduction over precount. As per PD ratio, pymetrozine 50 WG @ 0.5 g l-1 recorded the highest pest defender ratio. The grain yield recorded was higher in buprofezin 20 SP @ 1.6 ml l-1 treated plots with 67.98 per cent increase of yield over control followed by pymetrozine 50 WG @ 0.5 g l-1 (63.81 per cent).en-USnullThesis