Development of Ipm Module for Sustainable Management of Diamondback Moth (Plutella Xylostella Linn.) and Insecticides Residues Analysis in Cabbage

Abstract

The present investigations entitled “Development of IPM module for sustainable management of Diamondback moth (Plutella xylostella Linn.) and insecticide residues analysis in cabbage (Brassica oleracea Linn.)” was carried out during Rabi, 2018 and 2019 at Horticulture Research Center, Sardar Vallabhbhai Patel university of agriculture and technology, Meerut (U.P.). Diamondback moth population reached up to maximum level of 8.33 and 8.67 diamondback moth larvae/five plant during second week of January and first week of January during Rabi, 2018 and 2019. Mustard aphid, L. erysimis (kalt) population reached up to maximum level of 85.25 and 88.03 aphid/five plant during third week of December and third week of December during Rabi, 2018 and 2019. Cabbage butterfly population reached up to maximum level of 5.20 and 4.28 cabbage butterfly larvae/five plant during third week of December and third week of December during Rabi, 2018 and 2019. Cabbage semilooper Trichoplusia ni population reached up to maximum level of 2.92 and 2.93 cabbage semilooper larvae/five plant during second week of January and first week of January during Rabi, 2018 and 2019. Tobacco caterpillar Spodoptera litura (Hub) population reached up to maximum level of 3.42 and 2.93 tobacco caterpillar larvae/five plant during third week of January and third week of January during Rabi, 2018 and 2019. All the treatments reduce the natural enemy’s population as compared to control. Among all the module, module-1 was found most safe with maximum mean number of C. septempunctata (1.50 adult/five plant) and Spider (1.83 adult/five plant) followed by module-3, module-5, module-2 and module-6 with C. septempunctata population of 1.17, 0.67, 0.33 and 0.00 adults per five plants and Spider module-3, module-5, module-2, and module-6 with 2.50, 2.17, 1.67, and 1.00 per five plants, respectively. When the data of both the year were pooled and found all the module was found again effective and significantly superior over untreated control. Module-4 showed 0.00 DBM larvae/five plant was found most effective. It was followed by Module-6, Module-2, Module-5, Module-3 and Module-1 in which diamondback moth ranged from 0.00 to 2.83 DBM larvae/five plant respectively. Maximum diamondback moth larvae (8.67/five plant) were recorded in untreated control. A high polymorphism was observed among six populations of P. xylostella when genomic DNA was amplified with 12 random decamer primers. Minimum polymorphism (83.33 per cent) was observed in OPA-02 which produced 6 amplified bands followed by OPD-08 with 85.71 per cent polymorphism. OPC-09 showed 87.50 per cent polymorphism. Maximum similarity was observed between Research Field and Saharanpur (71.00), whereas, minimum (15.00) similarity was observed between AAU, Assam and BAU, Bihar populations of P. xylostella West Bengal populations showed 65.5 per cent similarity whereas population collected from Ambedkarnagar (U.P.) showed similarity more than 60 per cent with other two populations grouped in subcluster two. Population of BAU, Bihar showed about 50 per cent similarity. Maximum residue of Spinosad was 1.25 and 1.17 (ppm) found in module-6 fallowed by 1.23 and 1.19 (ppm) in module-4 during both Rabi, 2018 and 2019. Maximum residue of indoxacarb was 1.12 and 0.95 (ppm) found in module -2 fallowed by 1.14 and 1.02 (ppm) in module-4 during both Rabi, 2018 and 2019. Maximum residue of Lambda-cyhalothrin was 0.13 and 0.11 (ppm) found in module-5 fallowed by 1.14 to 0.13 (ppm) in module-4 during both Rabi, 2018 and 2019. Working out the cost benefit ratio of both years pooled data, revealed that the maximum incremental cost benefit ratio was recorded in the module-1 with 1:7.75 and followed by module-2, module-6, module-5 and module-3 with incremental cost benefit ratio of 1:4.00, 1:3.64, 1:3.23 and 1:2.78 respectively. The minimum ICBR of 1:1.98 was found in the module-4.