Abstract
ABSTRACTThe application of a mixture of pesticides to the agricultural field may adversely affect the health of non-target organisms besides the target ones. In the present study, the antagonistic effect of triazophos and deltamethrin (DM) in combination compared with individuals has been observed on earthworm, Eudrilus eugeniae. The LC50 value for formula grade pesticides viz. triazophos, DM and their combination was found as 76, 31 and 66 ng/cm2, respectively. To study the effect of sub-lethal dose (5% and 10% of LC50) of these pesticides on earthworm, E. eugeniae was exposed for 48 h by the paper contact toxicity method. Significant perturbations in oxidative stress parameters such as nonenzymatic (MDA, GSH) and enzymatic (SOD, CAT, GST, LDH, ACP, ALP, ALT and AST) were observed in tissue-specific (pre-clitellar, clitellar and post-clitellar) and dose-dependent manner. Histopathological studies of post-clitellar region of the body of earthworm showed severe damage in the exposed groups compared with control. The findings further indicate that the toxicity of pesticides was more pronounced in an individual than in the co-exposed group. Therefore, the changes speculate the potential health risk to these organisms on exposure at higher concentrations of the pesticides accumulated in soil.
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