A Study on Seasonal Incidence and Insecticide Efficacy against Helicoverpa armigera on Chick Pea
DOI:
https://doi.org/10.29070/nb6stb76Keywords:
Chickpea, Helicoverpa armigera, Biopesticides, Seasonal incidence, Insecticide efficacyAbstract
The gram pod borer, Helicoverpa armigera (Hubner), is a major constraint to chickpea (Cicer arietinum L.) production, particularly during the rabi season. The present study was undertaken to investigate the seasonal incidence of H. armigera on chickpea and to evaluate the comparative efficacy of selected biopesticides and a chemical insecticide through sequential spray applications. Field experiments were conducted during the rabi season at Rahatgarh, District Sagar (Madhya Pradesh), under natural field conditions using chickpea variety JG-315. Two rounds of foliar sprays were applied at pest initiation and 15 days later. Larval population was recorded before spraying and at 3, 7, and 14 days after each spray. The results revealed that H. armigera population gradually increased from the vegetative stage and reached its peak during flowering to pod formation, indicating a clear seasonal incidence pattern. All treatments significantly reduced larval population compared to the untreated control, with greater suppression observed after the second spray. The chemical insecticide recorded the highest reduction in larval population, yield, and benefit–cost ratio; however, certain biopesticides also showed promising efficacy and economic viability. The study concludes that timely and sequential application of biopesticides and chemical insecticides can effectively manage H. armigera on chickpea, supporting their use in sustainable pest management strategies.
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References
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