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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
biochemistry, genetics and molecular biology
Persistence and recycling of Bacillus sphaericus 2362 spores in Culex quinquefasciatus breeding sites in West Africa
Applied Microbiology and Biotechnology, Volume 25, No. 4, Year 1987
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Description
A flowable concentrate of Bacillus sphaericus strain 2362 was applied at 10 g/m2 against Culex quinquefasciatus mosquito larvae in cesspools. Complete control of larvae was maintained during 5 to 6 weeks, due to a very low settling of B. sphaericus spores, and was related to the presence of at least 100 to 500 spores per ml in upper water layers. Larval cadavers sedimented within 48 h after treatment. B. sphaericus was shown to recycle in dead larvae but not in mud. Spore persistence exceeded 5 months in bottom mud and the concentration of persistent spores was higher in cesspools, the bottom of which was cemented. Depth, temperature, pH, dissolved oxygen and suspended matter content of the water remained relatively constant throughout 4 months. In laboratory experiments, the final amounts of spores recycled in larvae was not influenced by spore concentration in water or by detergent, but it was affected by organic matter. Projected costs of B. sphaericus formulation indicates that its use even at high dosages, would be more cost effective than the use of chemical insecticides, especially where c. quinquefasciatus is resistant to these latter. A new strategy for controlling this vector could be deployed, using B. sphaericus and insect growth regulators in alternation. © 1987 Springer-Verlag.
Authors & Co-Authors
Nicolas, Luc
Cote D'ivoire, Bouake
Occge
Dossou-Yovo, Joël
Cote D'ivoire, Bouake
Occge
Hougard, Jean Marc
France, Marseille
Ird Institut de Recherche Pour le Developpement
Statistics
Citations: 32
Authors: 3
Affiliations: 2
Identifiers
Doi:
10.1007/BF00252544
ISSN:
01757598
e-ISSN:
14320614
Research Areas
Environmental
Study Locations
Multi-countries