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20211
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Subject: Entomology × Author: Abhishek . × End date: 2024 × Start date: 2020 × Type: Thesis ×
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    ThesisItemOpen Access
    Screening of advanced varieties and efficacy of different insecticides and biorationals against major insect pests of pigeon pea
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2021-07) Abhishek .; Tiwari, Ruchira
    The present field experiments were conducted to screen out different advanced varieties of pigeon pea and to validate the efficacy of different biorationals (Btk @2.0g/l, Btk @2.25g/l, Btk @2.5g/l, NLE@30ml/l, NLE@40ml /l, NLE@50ml/l, Azadirachtin@1500 ppm, NSKE @5 %) and insecticides i.e. (Deltamethrin 2.8 EC, Chlorpyriphos20 EC, Fipronil 80WG, Profenophos 50 EC, Quinalphos 25 EC, Acetamiprid 20 SP, Acephate 75 SP) and against major insect pests of pigeon pea during the kharif crop seasons, 2019-20 and 2020-2021 at Norman E. Borlaug Crop Research Centre, G.B. Pant University of Agriculture and Technology, Pantnagar, Uttarakhand. Under varietal trial, on the basis of less pod damage and high grain yield, PAU 881 (C) (7.00% and 958kg/ha) and IPH 15-03 (9.00% and 864 kg/ha) were the most effective against insect pest complex of pigeonpea. In entry PAU 881(C), the least numbers of Maruca webs/plant, number of H. armigera larvae and pod bugs were recorded i.e., 2.34, 1.71, 1.56 respectively with the least per cent of pod damage caused by Maruca, Helicoverpa and pod fly and seed damage by pod bugs was recorded (4.00, 1.00 and 2.00) and (11.94), respectively. Four advanced varieties, IPA 15-03, IPH 18-2, IPH 09-05, IPH 15-0 were recorded highly resistant to major insect pests of pigeon pea with PSR rating- 3. Among biorationals, pigeon pea plots treated with Azadirachtin@ 100ppm was recorded with the least cumulative pod damage (18.33%) followed by Btvar kurstaki @ 2.5 g/l (20.67%). The highest grain yield was recorded in plot treated with Azadirachtin 1500ppm (1150 kg/ha) followed by NSKE@ 5% (1092 kg/ha) and Bt var kurstaki @ 2.5 g/l (1025 kg/ha) in comparison to untreated control (742 kg/ha). In the context of cost benefit ratio calculated for tested biorationals, NSKE@ 5% and Azadirachtin 1500ppm @ 5ml/l were found the most effective biopesticides with low cost and high ICBR (1: 9.0 and 1:8.45.) against pod borer complex of pigeon pea. Similarly, among the chemicals tested against pod bugs, C. gibbosa, Acetamiprid 20 SP20 g a.i/ha and Acephate75 SP:750 g a.i/ha also recorded the least seed damage (17.46% and 18.51%) and mean population of pod bug per plant (4.45 and 4.94), respectively.Acephate75 SP:750 g a.i/ha was found the best against pod bugs with highest grain yield (1279 kg/ha) followed by Acetamiprid 20 SP20 g a.i/ha (1241 kg/ha). The highest ICBR (13.01 and 11.07) was also calculated in Acephate75 SP:750 g a.i/ha and Acetamiprid 20 SP20 g a.i/ha, respectively. On the basis of above findings, the present study clearly showed that the resistant varieties along with application of biorationals and insecticides were found the most effective for the management of major insect pests of pigeon pea. Thus, it can finally be concluded that in an Integrated Pest Management (IPM) programme, along with chemicals, eco-friendly approaches can easily be incorporated for the management of major insect pests of pigeon pea.