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Persistence of Vectobac WDG and Metoprag S-2G against Aedes aegypti larvae using a semi-field bioassay in Rio De Janeiro, Brazil

Revista do Instituto de Medicina Tropical de Sao Paulo, ISSN: 0036-4665, Vol: 47, Issue: 1, Page: 7-12
2005
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Article Description

Persistence of Bacillus thuringiensis var. israelensis (Vectobac WDG) and methoprene (Metoprag S-2G) was evaluated against Aedes aegypti late third instar larvae of the Rockefeller strain in a semi-field bioassay. Tests were performed in Rio de Janeiro, using containers made of plastic, iron, concrete and asbestos, placed in a shaded area. The formulations used were 0.2 g of Vectobac-WDG and Ig of Metoprag S-2G per 100 liters of water in house storage containers. Vectobac WDG was tested twice, in March and in April/May, 2002. In March (temperature ranging from 21.5 to 39.3 °C), 70-100% mortality was observed by the 7 day and declined abruptly thereafter. No significant differences were observed among the container types. In April/May (18.6 to 34.8 °C) mortality was higher than 70% to 30-36 days in all cases, except in the iron container (40% mortality on the 12 day). Metoprag S-2G was evaluated in April/May, 2002, and induced mortality higher than 70% up to 15 days in the plastic and iron containers and only seven days in the concrete container. In the asbestos container, maximal mortality was achieved on day one post-treatment (66%). Our results point to a low persistence of both formulations in the weather conditions of Rio de Janeiro.

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