ACUTE TOXICITY AND SUBLETHAL EFFECT OF CARBARYL ON BIOCHEMICAL RESPONSES OF INDIAN EARTHWORM ......

The use of several insecticides in agricultural fields has also put soil beneficial organisms at jeopardy. Earthworms are an important part of the soil biota. In South India, carbaryl was a widely used insecticide against a variety of insects. As a result, the goal of this study was to determine the acute toxicity and sublethal effect of carbaryl on L. mauritii biochemical responses. Earthworm mortality was measured at 24, 48, 72, 96, and 120 hours after exposure to various carbaryl concentrations for an acute toxicity research. Sublethal carbaryl concentrations (T1- 4.195 ppm and T2-13.984 ppm) were chosen from the study, and the activity of the following enzymes were estimated: superoxide dismutase (SOD), catalase (CAT), glutathione-s-transferase (GST), and acetyl cholinesterase (AChE). The levels of lipid peroxides (LP) and glutathione (GSH) were also measured. The activities of GSH, SOD, CAT, GST, and AChE were lower than the control for the first 15 days, then marginally rose on day 30. Until 15 days, high levels of LP and GSH were found, then they began to decline on the 30th day. The presence of carbaryl residues in the soil substrate as well as the body of the earthworm impeded the normal metabolic reactions of earthworms for up to 15 days, according to the findings. On the 30th day of the experiment, recovery was observed due to microbial carbaryl breakdown.

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