COMPARATIVE TOXICITY STUDIES OF FOUR PESTICIDES ON THE EPIGEIC EARTHWORM PERIONYX EXCAVATUS IN TWO DIFFERENT SOIL MEDIAS. SANYAL, R. DASGUPTA, A. KAVIRAJ AND P. P. CHAKRAVORTYAbstract The LC50 values of four insecticides were recorded at 96 hours, under suitable laboratory conditions, on a non-target epigeic earthworm Perionyx excavatus in two different Soil media, viz, the natural garden soil and the artificial OECD (Organisation for Economic Co-operation and Developement) soil, composed as per OECD guidelines. The physiochemical parameters of both the soil media, viz, pH and Organic carbon content were measured and the temperature and moisture content were kept constant. The Pyrethroid pesticide, Cypermethrin was found most toxic in both natural garden soil (LC50 value-0.012 mg/kg) as well as Artificial OECD soil (LC50 value-0.013 mg/kg) followed by Pendimethalin, Dimethoate and Pretilachlor.
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