Toxicity of Certain Pesticides to Two Economic Species of Snails in Northern India

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Abstract
Laboratory studies on toxicity of three carbamate (mexacarbate, carbaryl, and aldicarb) and three organophosphorus (trichlorfon, formothion, and phorate) compounds were made on two species of snails, Lymnaea acuminata Lamarck and Pila globosa Swainson. L. acuminata was more sensitive to the pesticides tested. LC50 values computed for different exposure periods from 24 to 240 h showed a gradual decrease as the exposure time was increased. Although trichlorfon was most toxic to L. acuminata and mexacarbate to P. globosa, the relative LC50s of the six compounds varied at different exposure periods. A possible explanation on the basis of pharmacological evidences and structure-activity of these compounds has been given.