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ThesisItem Open Access Studies on growth development and feeding potential of chrysoperla carnea (stephens) reared on different host insects(Vasantrao Naik Marathwada Krishi Vidyapeeth, Parbhani, 1997-12-12) Thite, Nagnath Ramkrishna; Shivpuje, P.R.ThesisItem Open Access Studies on effects of repeated application of synthetic insecticides on insect fauna of Bt cotton(Vasantrao Naik Marathwada Krishi Vidyapeeth, Parbhani, 2019-07-24) Binu. V; Bhede, B.V.An experiment was conducted during Kharif2018-19at the Experimental farm, Department of Agril. Entomology, VasantraoNaikMarathwadaKrishiVidyapeeth, Parbhani. The experiment was laid out in Randomized Block Design with three replications in 4.8 m x 4.2 m plot.The effect of repeated use of various insecticides like Imidacloprid 17.8% SL, Fipronil 5% SC, Lambda cyhalothrin 5% EC, Spinosad 45% SC, Acephate 75% SP, Buprofezin 25% SC, Flonicamid 50% WG, Acetamiprid 20% SP, Profenofos 50% EC, Diafenthiuron 50%WP, Acephate 50% + Imidacloprid 1.8% SP, Pyriproxyfen 5% + Fenpropathrin 15% EC, Profenofos 40% + Cypermethrin 4% EC were compared with the untreated control. The observations on the insect fauna population of Bt cotton were recorded 1 day before spraying, then 1, 3, 7 and 14 days after each spraying. A total of five such sprayings were taken. The sucking pests were reduced effectively by Flonicamid 50% WG, Buprofezin 25% SC and Diafenthiuron 50% WG. Their efficiency were found at par with each other against jassids, thrips, whiteflies, aphids and mealybugs.The drastic increase in use of Fipronil 5% EC for the past 5 years along with the repeated use of synthetic pyrethroids are responsible for resurgence of whitefly. This may be the reason that in the present studies, Fipronil 5% SC and Lambda cyhalothrin 5% EC has recorded maximum whitefly population in the fourth and fifth sprayings. The effect of repeated application of different insecticides on the pink bollworm revealed that, Lambda cyhalothrin 5% EC was the best treatment against Pink bollworm, followed by Profenofos 40% + Cypermethrin 4% EC, Spinosad 45% SC, Profenofos 50% EC, Acephate 50% + Imidacloprid 1.8% SP and Acephate 75% SP.The effect of repeated applications of synthetic insecticides on the natural enemies depicted that Spinosad 45% SC, Flonicamid 50% WG and Buprofezin 25% SC were the safest insecticides, showing maximum natural enemies population. Imidacloprid 17.8% SL, Fipronil 5% SC and Lambda cyhalothrin 5% EC recorded minimum natural enemies population marking its intense toxicity against them.The highest seed cotton yield was recorded in Lambda cyhalothrin 5% EC, due to its high efficiency in reducing the boll damage by pink bollworm. The yield shown by Lambda cyhalothrin 5% EC was on par with Profenofos 40% + Cypermethrin 4% EC and Profenofos 50% EC.Hence the present studies revealed that repeated application of any insecticides, particularly Fipronil 5% SC and Lambda cyhalothrin 5% EC should be avoided.ThesisItem Open Access Growth and development of green semilooper, Trichoplusia ni (Hubner) on different host plants(Vasantrao Naik Marathwada Krishi Vidyapeeth, Parbhani, 2004-06-25) Zote, Vaishali Keshavrao; Bilapate, G.G.ThesisItem Open Access Bioefficacy and dissipation studies of newer insecticides against key pests of Okra [Abelmoschus esculentus [L.] Moench](Vasantrao Naik Marathwada Krishi Vidyapeeth, Parbhani, 2006-11-27) Gosalwad, Sadashiv Sayanna; Kawthekar, B.R.ThesisItem Open Access Studies on crop losses, economic threshold and chemical control of bollworms in Marathwada region(Vasantrao Naik Marathwada Krishi Vidyapeeth, Parbhani, 1990-12-27) Kurtadikar, Jivan Shankarrao; Raodeo, A.K.ThesisItem Open Access Field life-tables and population dynamics of major pests of soybean(Vasantrao Naik Marathwada Krishi Vidyapeeth, Parbhani, 2006-05-31) Magar, Santosh Anandrao; Madansure, A.N.ThesisItem Open Access Growth and development of Helicoverpa armigera (Hubner) on different varieties of sunflower(Vasantrao Naik Marathwada Krishi Vidyapeeth, Parbhani, 2006-05-31) Tarange, Akshay Dinkar; Shetgar, S.S.ThesisItem Open Access Studies on pest infestation in organic farming of sorghum based intercrop(Vasantrao Naik Marathwada Krishi Vidyapeeth, Parbhani, 2005-06-24) Sisode, Rahul Bapu; Sarkate, M.B.ThesisItem Open Access Insecticide resistance in Helicoverpa armigera (Hubner) in cotton ecosystem(Vasantrao Naik Marathwada Krishi Vidyapeeth, Parbhani, 2006-05-24) Bhosale, Shwetambari Vasantrao; Suryawanshi, D.S.