Abstract
SUSCEPTIBILITY OF ANOPHELES MOSQUITOES TO AGRICULTURAL PESTICIDES (MALATHION, CARBARYL)

*Dr. Mohammed Ismail Humaida, Abdulgadir Almubark Eltyeb and Dr. Ahmed Subahi Ahmed

ABSTRACT

Background: Insecticide-tolerant strains of the mosquito vector have been identified as key factors of resurgence of Malaria. Objective: This study aimed to examine the susceptibility of anopheles mosquitoes to agricultural pesticides (Malathion and Carbaryl). Methodology: Larvae of Anopheles gambiae mosquitoes were collected from El-Mogran area, Khartoum State, Sudan. The collection process was performed using an enamel bowl to collect larvae from the edge of body of water. Within two hours after collection, all sampled larvae were transported to medical entomology laboratory. In the laboratory, the mosquitoes 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. Tests of larval susceptibility of mosquitoes were conducted folowed the recommendations of WHO materials and methods. The results recorded after 24h. Results: The study revealed that there is difference in mosquitoes mortality for the same dose, in the trials of Malathion, the higher concetration that achieved 100% kill is 2.5x10-5 %, (0.25 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 3x 10-6 %, (0.03mg/L) and 1x10-5 %, (0.1 mg/L) respectively. Malathion more toxic to mosquitoes as compared with Carbaryl. Conclusion: Both Malathion and Carbaryl have toxic effect on mosquitoes. There should be co-ordination between ministry of health and ministry of agriculture to control of malaria vectors and agricultural pests together.

Keywords: Susceptibility, Mosquitoes, Malathion, Carbaryl.


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