Field and laboratory studies on water conditions affecting the potency of VectoBac® (Bacillus thuringiensis serotype H-14) against larvae of the blackfly, Simulium damnosum

Show simple item record Wilson, M.D. Akpabey, F.J. Osei-Atweneboana, M.Y. Boakye, D.A. Ocran, M. Kurtak, D.C. Cheke, R.A. Mensah, G.E. Birkhold, D. Cibulsky, R. 2019-03-22T08:53:25Z 2019-03-22T08:53:25Z 2005-12
dc.identifier.other Volume 19, Issue 4, Pages 404-412
dc.description.abstract River water conditions that might influence the efficacy of VectoBac®, a formulation of the microbial insecticide Bacillus thuringiensis H-14 Berliner against Simulium damnosum sensu lato Theobald (Diptera: Simuliidae) larvae were investigated. A standard formulation was assayed 130 times over 15 months using a mini-gutter system at a field station beside the River Pra in Ghana. The lethal concentration (LC) values, river temperature, conductivity, turbidity and pH were analysed using univariate and multivariate statistics to identify which of these parameters influenced its performance. River temperature, conductivity and turbidity (in that order) were identified as having direct effects on the potency of VectoBac®. Water temperature and conductivity were negatively correlated, whereas turbidity and pH were positively correlated with LC values. Analyses of river water samples revealed that despite observed differences in total solids, sodium and potassium cations and chloride concentrations, all the parameters measured did not differ significantly between wet and dry seasons. A simple method for rearing S. damnosum s.l. in the laboratory was then adopted to study the effect of conductivity on potency of VectoBac® under controlled conditions. Increasing the conductivity of the water medium up to 3000 μS enhanced potency by about 42%, whereas increasing that of the insecticide alone raised it by 37%. The results obtained suggest that for effective use of VectoBac® for blackfly control in West Africa, river temperature, conductivity and turbidity should be taken into consideration, perhaps by only selecting rivers with optimal conditions for treatment. The laboratory-based system developed for assaying the product overcomes the vagaries associated with field conditions and also the demand for huge logistic requirements of the mini-gutter system, which has to be sited near rivers. © 2005 The Royal Entomological Society. en_US
dc.language.iso en en_US
dc.publisher Medical and Veterinary Entomology en_US
dc.subject δ-endotoxins en_US
dc.subject Bacillus thuringiensis serotype H-14 formulation en_US
dc.subject Conductivity en_US
dc.subject Ghana en_US
dc.subject Insecticides en_US
dc.subject Larvicides en_US
dc.subject Lethal concentrations en_US
dc.subject Onchocerciasis en_US
dc.subject pH en_US
dc.subject Pra River en_US
dc.subject River water conditions en_US
dc.subject Simulium damnosum en_US
dc.subject Temperature en_US
dc.title Field and laboratory studies on water conditions affecting the potency of VectoBac® (Bacillus thuringiensis serotype H-14) against larvae of the blackfly, Simulium damnosum en_US
dc.type Article en_US

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  • Department of Animal Biology and Conservation Science (DABCS) [201]
  • Parasitology Department [275]
    The Department of Parasitology conducts research into parasitic diseases of public health importance with the overall goal of reducing their transmission and the heavy disease burden that they impose on affected populations. The Department maintains focus on parasitic diseases in general. These include major diseases such as malaria, and others listed under the Neglected Tropical Diseases (NTD) control initiative such as, lymphatic filariasis, onchocerciasis, schistosomiasis, soil-transmitted helminthiasis, trypanosomiasis and leishmaniasis.

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