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Boletín de Malariología y Salud Ambiental
Print version ISSN 1690-4648
Abstract
BERTI MOSER, Jesús et al. Field trials on the efficacy and persistence of three formulations of Bacillus sphaericus against larvae of Anopheles aquasalis Curry in mangroves of Mariño municipality, Sucre state, Venezuela.. Bol Mal Salud Amb [online]. 2012, vol.52, n.1, pp.67-77. ISSN 1690-4648.
Anopheles aquasalis Curry is the main vector of malaria in northeastern Venezuela. A study of biological control of An. aquasalis larvae was carried out in Río Chiquito Abajo, Sucre State, Venezuela. The objective of this study was to evaluate effectivity and persistence of three formulations of Bacillus sphaericus against larval populations of An. aquasalis. The main breeding-sites of An. aquasalis are seasonal brackish mangrove with Avicennia germinans and semi-permanent freshwater wetlands with herbaceous emergent vegetation. A typical seasonal brackish mangrove with Avicennia germinans was selected. In these breeding-sites of An. aquasalis, three commercial formulations of B. sphaericus: VECTOLEX® CG-7.5%, VECTOLEX® WGD-51.2% and GRISELESF were evaluated in field trials. According to the results obtained VECTOLEX® CG-7.5% was effective against An. aquasalis larvae during 7 days post-treatment at rates not lower than 30 Kg/ha (3 g/m²), producing a larval reduction greater than 92.3%. This granular formulation provided very good larval control during 7 days. The two dosages (30 and 40 Kg/ha) had the same efficacy against An. aquasalis larvae. The second commercial formulation VECTOLEX® WGD-51.2% was effective against An. aquasalis larvae at dose of 2.0 Kg/ ha, producing a larval reduction greater than 85 % during 8 days post-treatment, and only 13.3 % larval reduction at 16 days after treatment; but the same formulation with at dose of 2.5 Kg/ha was more effective, producing a larval reduction greater than 90 % during 16 days posttreatment. In the same brackish mangrove, GRISELESF at rates not lower than 2.0 and 2.5 Kg/ha, appears to be less effective against An. aquasalis larvae, producing very low larval reduction at 8 and 16 days post-treatment.
Keywords : Bacillus sphaericus; Anopheles; biological control; microbial control; malaria; larvae; brackish mangrove; vectors; Sucre; Venezuela.
