Studies on incidence of insect pests in chickpea and biorational management of gram pod borner, Helicoverpa armigera (Hubner)
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Date
2021-01-21
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ANDUAT, Kumarganj
Abstract
“Studies on incidence of insect pests in chickpea and biorational management of gram pod borer, Helicoverpa
armigera (Hübner)” revealed that the larval population of H. armigera were noticed for the first time during 47th & 46th standard
week (SW) of Rabi season, 2017-18 & Rabi season, 2018-19. The minimum larval population of H. armigera was 0.26 & 0.33
larvae /plant recorded during 47th SW of Rabi season, 2017-18 & Rabi season, & 2018-19 followed by 0.40 & 0.47 larvae /plant
were recorded in 48th of Rabi season, 2017-18 & 46th SW of Rabi season, 2018-19. The maximum larvae were recorded in the
10th SW of Rabi season, 2017-18 & 12th SW of Rabi season, 2018-19 with respective larval population of H. armigera 3.13 &
3.86 / plant followed by 2.93 larvae & 3.54 larvae /plant in 9th SW of Rabi season, 2017-18 & 11th SW of Rabi season, 2018-
19.The incidence of H. armigera showed non-significant positive correlation with minimum temperature (0.166) during Rabi
season, 2018-19, maximum temperature (0.087) & (0.030) during Rabi season, 2017-18 & Rabi season, 2018-19 while minimum
temperature (-0.008) during 2017-18, relative humidity (-0.330) & (-0.233) and rainfall (-0.085) & (-0.169) showed nonsignificant
with negative correlation during Rabi season, 2017-18 & Rabi season, 2018-19.The minimum per cent parasitization
08.10 & 10.86 per cent was recorded during 14th SW of Rabi season, 2017-18 & Rabi season, 2018-19 during this week 37 & 46
larvae were collected from which 03 & 05 parasitoid emerged followed by 03rd SW of Rabi season, 2017-18 & 4th SW of Rabi
season, 2018-19, 44 & 47 larvae collected from which 06 & 06 parasitoids emerged resulting in 13.64 & 12.77 per cent
parasitization was recorded, respectively.The maximum per cent parasitization of 23.29 & 24.66 per cent was recorded during
10th SW of Rabi season, 2017-18 & 9th SW of Rabi season, 2018-19 as a result of emergence 17 & 18 parasitoids from 73 larvae
collected from Students’ Instructional farm followed by 11th SW of Rabi season, 2017-18 & 10th SW of Rabi season, 2018-19,
57 & 68 larvae of H. armigera were collected from which 13 & 15 parasitoids emerged resulting in 22.80 & 22.06 per cent
parasitization. During this period total 656 & 707 larvae of H. armigera were collected from which 121 & 124 parasitoids were
emerged, resulting in 17.74 & 17.11 per cent mean parasitization during crop period Rabi season, 2017-18 & Rabi season, 2018-
19, respectively.
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