Incidence and demographic parameters of Lipaphis erysimi (Kaltenbach) on rapeseed-mustard in Terai agro-ecological region of West Bengal
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Date
2025-02
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Publisher
Triveni Enterprises
Abstract
Aim:Assessment of Lipaphis erysimi incidence on different rapeseed-mustard varieties. Biology and life table study of L. erysimi on variety Binoy. Methodology: Experiments were conducted at the Uttar Banga Krishi Viswavidyalaya farm during Rabi season 2019-20 and 2020-21. Aphid and coccinellid populations were monitored on seven rapeseed-mustard cultivars at weekly intervals. The incidence was correlated to meteorological st conditions. Demographic factors of L. erysimi were investigated during the 1 fortnight of February for two generations on the Binoy variety in a greenhouse setting. th Results: Agrani and Binoy produced the best yield despite the highest aphid infestation. Aphid population rapidly increased from 4 standard th meteorological week (SMW) (flowering stage) and peaking during the 7 SMW (siliqual development stage). Different weather conditions have a nd th substantial effect on aphid and coccinellid populations. L. erysimi's nymphal period was longer during the 2 generation, which finished at the 7 SMW, st th whereas adult longevity and life cycle were longer during the 1 generation, which ended at the 6 SMW. Study on the demographic parameters showed th a diminishing population rate following the 7 SMW. Interpretation:Agrani and Binoy can tolerate aphid infestation. Protective measures need to be initiated before crop flowering.
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Keywords
Biology, Coccinellid, Life table, Mustard aphid, Weather parameters
Citation
Sarkar SK, Saha S, Nath R, Chaudhuri N, Ghosh J, Ghosh A, Senapati S.K. . Incidence and demographic parameters of Lipaphis erysimi (Kaltenbach) on rapeseed-mustard in Terai agro-ecological region of West Bengal. Journal of Environmental Biology. 2025 Feb; 46(1): 66-76