Abstract
Field trials performed in flooded rice at nine locations in West Bengal, Orissa and Bihar during the 1986 wet (kharif) and 1987 (boro) dry season showed that rice yields as well as densities of major rice pests were higher in the high nitrogen treatments. Scheduled insecticide applications reduced densities of all pests but only by 20–30%. Insecticide did not increase rice yields but pest densities, with the exception of yellow stemborer, were below application thresholds which are currently recommended. At most sites brown planthopper was more abundant than green leafhopper during the boro season and vice versa during the kharif. Stemborer densities exceeded the application threshold (1 moth /m2) at most sites during the boro only. Even in ‘pest endemic areas’, rice pest problems in the trials were few, suggesting that insecticide use was rarely necessary over the region as a whole during these two seasons. This emphasizes the importance of need- based insecticide use rather than prophylaxis.
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© 1990 Society of Chemical Industry
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Chakraborty, D.P., Maslen, N.R., Holt, J. (1990). Effects of Nitrogenous Fertilizer, Insecticides and Plant Spacing on Insect Pests and Yields of Flooded Rice in Eastern India. In: Grayson, B.T., Green, M.B., Copping, L.G. (eds) Pest Management in Rice. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-0775-1_13
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DOI: https://doi.org/10.1007/978-94-009-0775-1_13
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