Evaluation of an experimental product based on Bacillus thuringiensis sorovar. israelensis against Aedes aegypti larvae (Diptera:Culicidae)

The larvicidal activity of an experimental formulation of Bacillus thuringiensis israelensis (Bti) against Aedes aegypti larvae was evaluated under laboratory and simulated field conditions (SFC). Samples of technical powder (TP) were assayed to establish the LC 50 and the potency of the product. Th...

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Bibliographic Details
Published in:	Biological control Vol. 41; no. 3; pp. 339 - 347
Main Authors:	de Araújo, Ana Paula, de Melo-Santos, Maria Alice Varjal, Carlos, Sidney de Oliveira, Rios, Eugênia Maria Mariz Maranhão, Regis, Lêda
Format:	Journal Article
Language:	English
Published:	Elsevier Inc 01-06-2007
Subjects:	Aedes aegypti Bacillus thuringiensis Bacillus thuringiensis israelensis Bacillus thuringiensis subsp. israelensis bacterial insecticides Bti Entomopathogenic bacteria larvae larvicides lethal dose 50 mortality Mosquito control pesticide formulations pesticide persistence powder formulations residual effects Semi field test Tablet formulation tablet formulations toxicity Entomopathogenic bacteria Semi field test Tablet formulation Mosquito control Bti
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Summary:	The larvicidal activity of an experimental formulation of Bacillus thuringiensis israelensis (Bti) against Aedes aegypti larvae was evaluated under laboratory and simulated field conditions (SFC). Samples of technical powder (TP) were assayed to establish the LC 50 and the potency of the product. The larvicidal activity of the TP and the tablet (T) were evaluated under SFC to assess the efficacy and the residual activity, measured against Ae. aegypti larvae. Either a T or 250 mg of TP were added to 50 L of water in plastic containers. Containers were exposed to sunlight or kept in the shade. Results showed a LC 50 of 0.26 mg/L and a potency of 750 ITU/mg. In spite of differences in the toxicity amongst TP and T samples, all of them killed 98–100% of the larvae and the mortality remained high for six months, in the shade. The replacement of 20% or 60% of the water volume did not affect the activity of the product. Seasonal differences influenced the persistence of the product in containers exposed to sunlight. Both formulations showed an excellent performance, especially when kept in the shade. The Bti tablet evaluated in this study is potentially very useful in programs to control dengue vectors.
Bibliography:	http://dx.doi.org/10.1016/j.biocontrol.2007.03.002 ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	1049-9644 1090-2112
DOI:	10.1016/j.biocontrol.2007.03.002