Author(s): P. BHOWMIK, A. BANERJEE, MD. MOHASIN AND A. K. SOMCHOUDHURY

Abstract: A laboratory experiment was conducted to study the main as well as interaction effect of some herbicides on the mortality of one mollusc (Pila globosa), an important nontarget fauna found in agricultural ecosystem. Four herbicides (ml or g / l of water) viz. paraquat 24% SL@ 10 ml and 20 ml, 2, 4-D Na salt 80%@ 5 g and 10 g, glyphosate 41% SL@ 10 ml and 20 ml and 2, 4-D + glyphosate @12 ml and 24 ml at different period of exposure were evaluated. It was found that mollusc released on paraquat treated soil, applied at double to that of recommended dose caused maximum mortality. However, all the tested herbicides were safe to the mollusc species at recommended dosages in terms of mortality, and treatments were statistically at par. Increase of exposure period subsequently increased mortality of mollusk species. The experiment was analyzed using asymmetrical factorial design.

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