S.B. Singh1, S.N. Upadhyay1, Nikki bhardwaj*2 and, g.s. chundawat3
1Department of Entomology, College of Agriculture, Indore, Madhya Pradesh-452001
2School of Agricultural Sciences, Jagannath University Jaipur, (Raj.)-303901
3Horticulture collage (KVK), Mandsaur, Madhya Pradesh-458001
Email: nikkibhardwaj7610@gmail.com
Received-04.07.2018, Revised-25.07.2018
Abstract: The field investigation was carried out during Kharif season of 2014-15 in the research farm of College of Agriculture, Indore (M.P.) in randomized block design with eight treatments and three replications with plant spacing of 45×60 cm on Pusa Jwala variety of chilli against thrips. Six repeated application of Metarrhizium annisoplae in the name of Met 52 with different doses at 10 days interval were made and it was also alternated with thiacloprid and different doses of fipronil 5 S C The treatments were named as T1- Untreated control, T2- Fipronil 5 SC @ 1000 ml/ha and alternated with Thiacloprid 21.7 SC @ 300 ml/ha, T3- Met52@ 250ml/ha foliar spray, T4- Met52@ 500ml/ha foliar spray T5- Met52@ 1000ml/ha foliar spray, T6- Met52@250ml/ha foliar spray alternated with Fipronil 5 SC @ 850 ml/ha, T7- Met52@ 500ml/ha foliar spray alternated with Fipronil 5 SC @ 900 ml/ha and T8- Met52@ 1000ml/ha foliar spray alternated with Fipronil 5 SC @ 950 ml/ha The population of thrips was counted at ten days interval on five tagged plants from each plot and five leaves from each plant with the help of 10X magnifying lens. Overall population reduction was calculated based on pre treatment observation and last observation of final spray. The overall highest population reduction was also calculated in T5 (99.63%), and followed with T4 (99.27%). T3 (98.65%), T8 (97.36%), T7 (96.45%), T6 (95.13%) and T2 (85.52%). The highest dried chilli yield with highest cost benefit ratio was noted in T5 (2256kg/ha. and 2.34) and differed significantly with all the treatments.
Keywords: alternation, bio-insecticide efficacy, Chilli,insecticides, Metarrhizium annisoplae, Scirtothrips dorsalis
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