The influence of four pesticides (Cyren, Ridomil, Triplen and Mamba) on Lumbricus terrestris earthworm for 4 weeks was studied in the laboratory. Results indicate that there are loss of weight in all cultures, signs and symptoms of toxicity such as coiling, selling of the body swollen, sluggish movements and discharge of coelomic fluid. Significant decrease in total sperm numbers was observed at the end of study period. The present study indicates that among the four pesticides tested Cyren is the most toxic to earthworm Lumbricus terristris causing high mortality, while Triplen and Mamba are moderately toxic and Ridomil was the least toxic pesticide.