Studies on antixenosis mechanism of resistance to Helicoverpa armigera (Hübner) in different Chickpea germplasms
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Date
2022-01
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G.B. Pant University of Agriculture and Technology, Pantnagar, District Udham Singh Nagar, Uttarakhand. PIN - 263145
Abstract
The present investigations on “Studies on antixenosis mechanism of resistance to Helicoverpa armigera (Hübner) in different Chickpea germplasms” was carried out in Norman E. Borlaug Crop Research Centre (CRC), Department of Entomology G.B. Pant University of Agriculture and Technology, Pantnagar during rabi season of 2020-21 with the objective to identify the source of resistance in chickpea germplasm against H. armigera Preliminary screening of 201 chickpea germplasms was carried out to evaluate the resistance against H. armigera. Out of 201 germplasms eleven germplasms were found promising on the basis of pest susceptiblity rating (PSR). Further these promising germplasm were evaluated for the confirmation of resistance under laboratory conditions. Observation recorded over different crop stages revealed that, the minimum no. of egg (0.50 eggs/ plant) and larval population (0.63 larvae/ plant) was recorded on GJG 1803 and GJG 1801. Minimum pod damage of 2.08 per cent was recorded on GJG 1803. The maximum grain yield of 4711.1 kg/ha was recorded on RLBGMH-G. The germplasm viz. BG 4017, GJG 1803, GJG 1801, NBeG 1635, RLBGMH-G, NBeG 810, NBeG 857 were rated as least susceptible based on pest susceptible rating. Maximum glandular trichome density (20.30 trichomes per mm2) on upper leaf surface was recorded in DHMC 18-1664 and NBeG 810 whereas minimum glandular trichomes was recorded in GJG 1803 (6.50 trichomes per mm2). Similarly, the highest non-glandular trichome density (63 trichomes per mm2) on upper leaf surface was recorded in DHMC 18-1664 and lowest trichomes density (13.33 trichomes per mm2) in NBeG 857. The maximum number of glandular trichomes (35.30 trichomes per mm2) on pod was recorded on DHMC 18-1664 whereas the minimum glandular trichome density (20.60 trichomes per mm2) was observed on BG 4017. On the upper surface of the leaf, the minimum glandular trichome length was recorded on NBeG 1635 (225.60 μm), whereas the maximum glandular trichome length was observed on NBeG 810 (300.50 μm). Similarly, the maximum and minimum non-glandular trichome length was recorded in NBeG 810 (245.10 μm) and RLBGMH-4 (180.35 μm), respectively. The highest glandular trichome length on pod was recorded on DHMC 18-1664 (311.05 μm) whereas lowest trichome length was recorded on GJG 1801 (240.71μm) respectively. Through chemical antixenotic resistance on growth and development of H. armigera results revealed that germplasm GJG 1803 recorded lowest (70.65 mg) weight gain in larva with damage rating (DR 4.56) and pupal weight (255.2 mg) whereas germplasm NBeG 1635 recorded highest (105 mg) weight gain in larva.