Density dynamics of the entomopathogenic fungus, Beauveria bassiana Vuillemin (Deuteromycotina: Hyphomycetes) introduced into forest soil, and its influence on other soil microorganisms

概要

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Beauveria bassiana conidia were mixed into the forest soil, and the density dynamics of soil microorganisms were investigated using selective media to clarify the impact of B. bassiana application on them. The density of bacteria was between 1×10^6 and 10^8 CFU/g, and that of actinomycetes was around 1×10^6 to 10^7 CFU/g regardless of the addition of B. bassiana. Densities of general fungi and of B. bassiana in the non-treatment plot were always approximately 1×10^5 CFU/g and 1×10^2 CFU/g, respectively. On the other hand, densities of both general fungi and B. bassiana in the treatment plot increased to 3 to 5×10^7 CFU/g immediately after the mixing of B. bassiana. Densities gradually decreased to 1/10 the density after 12 months. Microscopic observations revealed that B. bassiana conidia do not germinate in non-sterilized soil, but they do germinate in sterilized soil. Densities of fungi other than B. bassiana could not be measured in the treatment plot. However, they were not thought to be affected by mixing of B. bassiana, because the metabolism of B. bassiana seemed to be very inert.
日本応用動物昆虫学会の論文
2002-05-25