Impact of polymer seed coating on major insect pests of soybean
Sonule GP, More DG, Bokan SC
Field experiment was conducted during Kharif 2017 at the farm of All India Coordinated Research Project on Soybean, Vasantrao Naik Marathwada Krishi Vidyapeeth, Parbhani (Maharashtra) to study Impact of polymer seed coating on insect pests of soybean. Significantly less girdle beetle infestation of 6.00 and 10.16 per cent was recorded in treatment T1 i.e. JS 335 seed treated with carboxin and thiamethoxam with polymer coating as against of 10.50 and 16.83 per cent infestation in treatment T2 i.e. carboxin and thiamethoxam without polymer coating. Significantly less stem tunneling of 33.39 per cent was observed in T1 as compaired to T2 (41.01 per cent). Treatment T1 showed significantly less defoliator population of 1.13 and 2.13 larvae/mrl at 30 and 45 DAG than treatment T2 which recorded 1.76 and 2.90 defoliators/mrl, respectively. Treatment T1 i.e. JS 335 with polymer coating showed significantly less whitefly population at 20 and 30 DAG (0.461/ leaflet and 1.4780/leaflet) than treatment T2 i.e. without polymer coating which recorded 0.867 and 1.571 whiteflies/leaflet, respectively. Comparatively very less population of whitefly might be the result of non-significant differences among the two treatments. Treatment T1 recorded 1424.60 kg/ha yield while treatment T2 recorded 1304.60 kg/ha yield and the differences were found non-significant.