SUSCEPTIBILITY OF SCHISTOSOMAISIS SNAILS (BIOMPHALARIA PFEIFFERI) TO AGRICULTURAL PESTICIDES (MALATHION, CARBARYL)
Dr. Mohammed Ismail Humaida* and Dr. Ahmed Subahi Ahmed
ABSTRACT
Background: Snail control is one of the methods of choice for the control of transmission of schistosomaisis. Objective: This study aimed to determine the susceptibility of Biomphalaria snails to agricultural pesticides (Malathion and Carbaryl). Methodology: Field surveys were conducted for collection of Biomphalaria snails, from the irrigation canals of El-Selait agricultural schems in El-Faki Hashim area, Khartoum State. In the laboratory, the snails were divided into control group and study groups, the control group were not exposed to any pesticides except water, and the study groups were exposed to different concentrations of Malathion and Carbaryl pesticides. The results recorded after 24h. Results: The study revealed that there is difference in snail’s mortality for the same dose, in the trials of Malathion, the higher concetration that achieved 100% kill is 1.5x10-4 %, (1.5 mg/L). While in the trials of Carbaryl, the higher concetration that achieved 100% kill is 4.25x10-4 %, (4.25 mg/L). The study revealed that the lethal concentration LC50 for Malathion and Carbaryl is 1x10-5 %, (0.1 mg/L) and 6x10-5 %, (0.6 mg/L) respectively. Malathion more toxic for snails as compared with Carbaryl. Conclusion: Both Malathion and Carbaryl have toxic effect on snails. There should be co-ordination between ministry of health and ministry of agriculture to control of schistosomiasis snails and agricultural pests together.
Keywords: Susceptibility, Snails, Malathion, Carbaryl.
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