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Revista Peruana de Medicina Experimental y Salud Publica
versión impresa ISSN 1726-4634
Resumen
VARGAS V, Franklin et al. Producción de Bacillus thuringiensis H-14 var. Israelensis utilizando espárrago (Asparagus officinalis) y su uso potencial para el control de la Malaria en la Libertad- Perú. Rev. perú. med. exp. salud publica [online]. 2001, vol.18, n.3-4, pp.82-89. ISSN 1726-4634.
Objective: To standardize a culture medium using asparagus infusion (Asparagus officinalis) for the massive production of Bacillus thurigiensis (Bti) H-14 var. israelensis and to determine Bti bio-larvicide effect upon Anopheles sp. in natural breeding sites in Laredo district from January to December, 2000. Materials and methods: Three media based on white asparagus infusion were tested: M1: 100-mL infusion, pH: 9; M 2: 50-mL infusion plus 50-mL buffer phosphate, pH: 7, and M 3: 25-mL infusion plus 75-mL distilled water, pH: 9. The standard TPH medium was used as a control. Bti production in the different culture media was assessed in order to determine the bio-larvicide effectiveness using LC50 and LC90 The optimum culture medium (lower values for LC 50 and LC90) served for Bti production, and it was evaluated in laboratory and natural breeding sites. Effectiveness was determined measuring larval density prior and after Bti application. Results: The optimum medium for Bti production was M,. It showed high effectiveness, with 100% mortality under laboratory conditions, and 71-97% mortality in the field after 24 hours of exposition with three weekly applications. Conclusions: M1 is the optimum medium for culturing Bti, with high effectiveness for controlling Anopheles larvae both under laboratory and field conditions.
Palabras clave : Bacillus thuringiensis; Asparagus officinalis; Malaria/prevention & control; Vector control.