Resistance to Insecticides in Field-Collected Populations of Tea Mosquito Bug (Helopeltis theivora Waterhouse) From the Dooars (North Bengal, India) Tea Cultivations
Keywords:Insecticide resistance, Tea cultivations, Organochlorine, Organophosphates, Synthetic pyrethroids, Neonicotinoids, Helopeltis theivora
Dose (LC50) and time-mortality response (LT50) parameters are used to compare resistance levels of field-collectedpopulations of the tea mosquito bug, Helopeltis theivora (Waterhouse) from Kalchini tea plantations of the Dooars, North Bengal, India with the reference strain collected from Darjeeling foothills against eleven insecticides by following leaf-dip technique. Tea plantation of Darjeeling is largely organic, that had never used synthetic pesticides in its history, whereas Kalchini plantation is conventional that routinely uses synthetic pesticides. The field-collectedKalchini strain of H. theivora showed a high Resistance Ratio level (> 10 folds) both in LC 50 (20.00 - 17564.11 folds) and LT50 (20.20 - 45.99 folds) parameters for the tested insecticides. This is the firstreport on the reduced susceptibility of H. theivora populations to eleven insecticides (one organochlorine, three organophosphorus, two neonicotinoids and five synthetic pyrethroids) from Kalchini tea cultivations in the Northeastern Dooars region of India.
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