Dahiya, K.K.Rao, Naveen2018-02-172018-02-172017http://krishikosh.egranth.ac.in/handle/1/5810041027The present studies entitled “Studies on the efficacy of label claimed insecticides for whitefly Bemisia tabaci (Gennadius) (Homoptera: Aleyrodidae) in cotton Gossypium hirsutum L., under field and laboratory conditions” were carried out during Kharif 2016 at Cotton Research Area, CCS Haryana Agricultural University, Hisar. Under field conditions out of 14 label claimed insecticides evaluated, flonicamid 50 WG, dinotefuran 20% SG and ethion 50% EC were most effective in reducing whitefly adult population up to after seven days after spray, followed by pyriproxyfen 5% EC + fenpropathrin 15% EC and thiacloprid 21.7% SC. Fipronil 4% + acetamiprid 4% w/w and fenpropathrin 30% EC were least effective among all label claimed insecticides tested. Under in vitro conditions, flonicamid 50% WG was the most promising chemical against adults causing significantly higher adult mortality than all other insecticides tested. Ethion 50% EC, dinotefuran 20% SG and pyriproxyfen 5% EC + fenpropathrin 15% EC were found to be second best insecticides succeded by flonicamid. When bioefficacy of buprofezin 25 % EC was evaluated against whitefly adults, it was found to be least effective as it is chitin biosynthesis inhibitor in nymphal stage. Only, flonicamid 50 WG and buprofezin 25% EC were observed to be safer toxic to natural enemies viz., chrysoperla, spider and coccinellids while all other tested insecticides were found to be moderate to highly toxic.ennullThesis