Variation in endosulfan susceptibility and body lipid content of Helopeltis theivora Waterhouse (Heteroptera: Miridae) in relation to use pattern of insecticide in sub-Himalayan Dooars tea plantation.

摘要

Variation in relative susceptibility of endosulfan was observed for Helopeltis theivora populations from different tea growing subdistricts of the Dooars located in sub Himalayan region of North Bengal. On the basis of LC₅₀ values, levels of endosulfan susceptibility of H. theivora could be arranged in the order:- Kalchini population (1580.77 ppm) 50 values. Side by side a survey was conducted on pesticide use patterns in the Dooars tea plantations during 1998 to 2004. A computation of the data established that variation in endosulfan susceptibility and body lipid content of the Dooars population of H. theivora have a significant positive correlation with use pattern of the pesticides. This finding implies the role of the quantity of body lipid in furnishing greater tolerance to endosulfan and in turn how the use pattern of this insecticide in various tea subdistrict has induced greater tolerance i.e. less susceptibility in H. theivora population.