Ready-mix formulation consists of two insecticides—endosulfan (35 %) and cypermethrin (5 %). To understand the dissipation pattern of the insecticides on made tea from the north-east region of India, it was applied twice in 10 day interval @ 1,000 mL/ha (350 g a.i. endosulfan + 50 g a.i. cypermethrin) and 2,000 mL/ha (700 g a.i. endosulfan + 100 g a.i. cypermethrin) along with untreated control. The made tea samples were collected at 0, 1, 3 and 7 days interval after last application. The dissipation rate of endosulfan and cypermethrin followed first order kinetics. The calculated half-life values were found in the range between 1.7 to 2.1 days for endosulfan and 1.0 to 1.1 days for cypermethrin.
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The authors are very grateful to M/S Excel Industries Ltd., Mumbai for financial support and the Manager of Kamalpur tea estate, Darjeeling, West Bengal for conducting the field experiment.
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Pramanik, S.K., Saha, P., Bhattacharyya, A. et al. Studies on the Fate of Ready-Mix Formulation of Endosulfan and Cypermethrin in Tea. Bull Environ Contam Toxicol 89, 1016–1020 (2012). https://doi.org/10.1007/s00128-012-0808-3