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Insecticidal activity of Bacillus laterosporus
M V Orlova1, T A Smirnova, L A Ganushkina
1Institute of Genetics and Selection of Industrial Microorganisms, Moscow, Russia.
Applied and Environmental Microbiology
|July 2, 1998
Summary
Bacillus laterosporus bacteria exhibit larvicidal activity against key mosquito species. Purified B. laterosporus crystals show high toxicity, offering potential for mosquito control.
Area of Science:
- Microbiology
- Entomology
- Toxicology
Background:
- Mosquitoes like Aedes aegypti, Anopheles stephensi, and Culex pipiens are significant disease vectors.
- Biological control agents are sought for effective mosquito population management.
Purpose of the Study:
- To investigate the larvicidal potential of Bacillus laterosporus strains against medically important mosquito species.
- To identify the components of B. laterosporus responsible for its toxicity.
Main Methods:
- Testing the toxicity of Bacillus laterosporus strains 921 and 615 against larvae of Aedes aegypti, Anopheles stephensi, and Culex pipiens.
- Analyzing the association of larvicidal activity with bacterial spores and crystalline inclusions.
- Purifying and testing the toxicity of B. laterosporus 615 crystals.
Main Results:
- Bacillus laterosporus strains 921 and 615 demonstrated toxicity against Aedes aegypti, Anopheles stephensi, and Culex pipiens larvae.
- Larvicidal activity was linked to spores and crystalline inclusions produced by B. laterosporus.
- Purified crystals from B. laterosporus 615 exhibited high toxicity towards Aedes aegypti and Anopheles stephensi.
Conclusions:
- Bacillus laterosporus possesses significant larvicidal properties against major mosquito vectors.
- Bacterial crystals are a key component mediating the toxicity of B. laterosporus.
- These findings suggest potential for developing B. laterosporus-based biological larvicides.