Germplasm screening, population dynamics and evaluation of IPM modules for the management of gram pod borer, Helicoverpa armigera (Hübner) in chickpea (Cicer arietinum L.)
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Date
2020-09-14
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ANDUAT, Kumarganj, Ayodhya
Abstract
The present investigations entitled “Germplasm screening, population dynamics and evaluation of IPM modules for the management of gram pod borer, Helicoverpa armigera
(Hübner) in chickpea (Cicer arietinum L.)” revealed that the larval population H. armigera
(Hub.) recorded at 50 per cent flowering stage, 50 per cent pod filling stage and mean per cent damage at maturity stage at weekly interval on 10 randomly selected plants starting with 50 per cent flowering stage, 50 per cent pod filling stage and maturity stage ranged 2.90 to 8.30, 3.10 to 9.40 larvae/ 10 plants and 12.97 damage per cent larvae to 37.12 per cent during Rabi, 2017-18 and 3.33 to 8.00, 3.80 to 10.20 larvae/ 10 plants and 13.25 damage per cent to 36.48 per cent during Rabi, 2018-19 respectively. During Rabi, 2017-18 the results revealed that the out of 50 germplasm screened against H. armigera 38 germplasms with PSR (8-9) were found highly susceptible; only 4 germplasms with PSR (6-7) found moderately susceptible and only 7 germplasms with PSR (3-5) were found least susceptible. None of the germplasm fell under highly resistant category (1-2) PSR. Out of 50 germplasm screened against H. armigera 38 germplasms with PSR (8-9) were found highly susceptible; only 3 germplasms found moderately susceptible and only 8 germplasms with PSR (3-
5) were found least susceptible. None of the germplasm fell under highly resistant category (1-2) PSR during Rabi, 2018-19. Maximum larvae were recorded in the 10th SW and 9th SW with respective larval population of 3.15 & 3.16 during Rabi, 2017-18 and Rabi, 2018-19, respectively and Minimum over all mean larvae recorded in 45th SW were 0.24 & 0.39 larvae/ plant during Rabi, 2017-18 and Rabi, 2018-19. It is evident from data that larval population showed non-significant negative correlation with minimum temperature (-0.050), relative humidity (-0.349) and rainfall (-0.063) while maximum temperature showed non-significant positive correlation (0.088) during Rabi,
2017-18. During 2018-19 the larval population showed non-significant negative correlation with minimum temperature, maximum temperature and rainfall (-0.403), (-0.022) and (-0.060) while relative humidity showed non-significant with positive correlation (0.149).
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