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|Title: ||Use of Bacillus thuringiensis var israelensis as a viable option in an Integrated Malaria Vector Control Programme in the Kumasi Metropolis, Ghana|
|Authors: ||Nartey, Rita|
Sylverken, Augustina Angelina
|Keywords: ||Anopheles gambiae|
Bacillus thuringiensis var israelensis
Water dispersible granule
|Issue Date: ||Dec-2013|
|Publisher: ||BioMed Central Ltd.|
|Citation: ||Nartey et al.: Use of Bacillus thuringiensis var israelensis as a viable option in an Integrated Malaria Vector Control Programme in the Kumasi Metropolis, Ghana. Parasites & Vectors 2013 6:116. Submit|
|Abstract: ||Background: Integrated Vector Control (IVC) remains the approach for managing the malaria-causing vector. The
study investigated the contribution of Bacillus thuringiensis israelensis (Bti) in the control of malaria by targeting the
larvae and also mapped and documented major breeding sites in the Kumasi metropolis, Ghana.
Methods: Using a hand held GPS receiver unit, major breeding sites within the metropolis were mapped out
during the larval survey. Mosquito larvae were then collected from the breeding sites and reared in an insectary to
obtain an F1 generation for laboratory bioassays. The minimum effective dosage of Bti Water Dispersible Granular
(WDG) formulation was determined by a series of bioassays. Based on the results obtained in the laboratory, the
optimum effective dosage of Bti formulations against naturally occurring larvae of the indigenous mosquito species
was determined through open field trials.
Results: A total of 33 breeding sites were identified and geo-referenced during the larval surveys with the majority
of the breeding sites located in the Asokwa sub-metropolis, Kumasi, Ghana. A Bti (3,000 International Toxic Unit
(ITU)/mg) concentration of 0.026 mg/l resulted in 50% mortality whilst a concentration of 0.136 mg/l resulted in
95% mortality. Results from the open field trials with Bti showed that a dosage of 0.2 kg/ha is as effective as
0.4 kg/ha in suppressing late instars and resulting pupae.
Conclusion: This study reveals that Bti at a very low dosage of 0.2 kg/ha is highly effective against Anopheles larvae
and therefore offers viable options for the management of vector mosquitoes. Further research is needed to extend
this to the field in order to determine its ability to reduce malaria incidence.|
|Description: ||An article published by BioMed Central Ltd. and also available at doi:10.1186/1756-3305-6-116|
|Appears in Collections:||College of Science|
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