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Control of Anopheles albimanus mosquitos in southern Mexico by spraying their preferred indoor resting sites.

The traditional indoor spraying technique to control Anopheles albimanus mosquitos was compared with a selective method that targets their preferred resting sites in coastal villages of southern Mexico. We also determined whether mosquitos changed their preferred resting sites following insecticide applications. In the selective spraying approach, two 1-m wide horizontal swaths of bendiocarb insecticide were applied 0.75-1.75 m from the base of the walls and at 1-m upwards from the base of the inner roof at a target dose of 0.4 g/m2. A 2-year follow-up (1988-90), which included four insecticide treatments, showed that the selective spraying was as effective as full spraying for controlling A. albimanus. Also the mosquitos preferred resting sites that were not modified by the insecticide applications. Finally, the use of this techniques required 46% less time and cost 67% less than conventional spraying.

Animals↗

Mosquito behavior and vector control.

Effective indoor residual spraying against malaria vectors depends on whether mosquitoes rest indoors (i.e., endophilic behavior). This varies among species and is affected by insecticidal irritancy. Exophilic behavior has evolved in certain populations exposed to prolonged spraying programs. Optimum effectiveness of insecticide-treated nets presumably depends on vectors biting at hours when most people are in bed. Time of biting varies among different malaria vector species, but so far there is inconclusive evidence for these evolving so as to avoid bednets. Use of an untreated net diverts extra biting to someone in the same room who is without a net. Understanding choice of oviposition sites and dispersal behavior is important for the design of successful larval control programs including those using predatory mosquito larvae. Prospects for genetic control by sterile males or genes rendering mosquitoes harmless to humans will depend on competitive mating behavior. These methods are hampered by the immigration of monogamous, already-mated females.

Animals↗