[Methods for evaluating Aedes aegypti populations and insecticide treatment in a town of Trinidad, West Indies].
A. aegypti populations in four neighborhoods of Flanigan Town, Trinidad, were evaluated for 32 weeks by means of egg-laying traps, capture with human bait, and larva searches. The egg-laying traps were more effective for evaluating the mosquito population (P less than 0.001) than capture with human bait or larva searches. During weeks 12 to 15, treatments were applied using different combinations of insecticides and spraying strategies: focal and perifocal (FPFS), house (HS), and ultra-low volume (ULVS). In the FPFS approach, all drinking-water containers were sprayed with temephos at a concentration of 1 mg/l, and areas around artificial containers were treated with fenthion at 40%. The HS was done on all surfaces of interior walls using fenthion (emulsifiable concentrate) at 55% in a proportion of 1.6 g/m2. The ULVS, done from trucks two days a week (Monday and Friday) from 1600 to 1900 in the afternoon, used technical grade malathion at 95% pulverized at a rate of 0.13 l/min. Reduction of the A. aegypti population was 62% in the area treated with FPFS and ULVS; 93% in the area that received FPFS and HS; 84% in area C, which was treated with FPFS, HS, and ULVS; and 77% in the index area, where only FPFS was applied. The results suggest that HS may be more effective than ULVS in reducing the A. aegypti population. The problems of hidden breeding sites are discussed, as is the role of gravid mosquitoes in the reinfestation of treated areas.
Chadee
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Ministerio de Salud, División de Control de Insectos Vectores, Trinidad.
D000330:Aedes; D000818:Animals; D004772:Entomology / Q000379:methods; D007306:Insecticides / Q000009:adverse effects*; D009032:Mosquito Control / Q000379:methods*; D009943:Organophosphorus Compounds; D011156:Population Density; D014300:Trinidad and Tobago
D007306:Insecticides; D009943:Organophosphorus Compounds
Métodos de evaluación de la población de Aedes aegypti y tratamientos con insecticidas en una población de Trinidad, Antillas.