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Incidence and demographic parameters of Lipaphis erysimi (Kaltenbach) on rapeseed-mustard in Terai agro-ecological region of West Bengal
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Incidence and demographic parameters of Lipaphis erysimi (Kaltenbach) on rapeseed-mustard in Terai agro-ecological region of West Bengal
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Incidence and demographic parameters of Lipaphis erysimi (Kaltenbach) on rapeseed-mustard in Terai agro-ecological region of West Bengal
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Journal Article
Incidence and demographic parameters of Lipaphis erysimi (Kaltenbach) on rapeseed-mustard in Terai agro-ecological region of West Bengal
2025
Overview
Aim: Assessment of Lipaphis erysimi incidence on different rapeseed-mustard varieties. Biology and life table study of L. erysimion 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 conditions. Demographic factors of L. erysimi were investigated during the 1st fortnight of February for two generations on the Binoy variety in a greenhouse setting. Results: Agrani and Binoy produced the best yield despite the highest aphid infestation. Aphid population rapidly increased from 4th standard meteorological week (SMW) (flowering stage) and peaking during the 7th SMW (siliqual development stage). Different weather conditions have a substantial effect on aphid and coccinellid populations. L. erysimi's nymphal period was longer during the 2nd generation, which finished at the 7th SMW, whereas adult longevity and life cycle were longer during the 1st generation, which ended at the 6th SMW. Study on the demographic parameters showed a diminishing population rate following the 7th SMW. Interpretation: Agrani and Binoy can tolerate aphid infestation. Protective measures need to be initiated before crop flowering.
