Biodegradation of entomopathogenic hyphomycetes: Influence of clay coating on Beauveria bassiana blastospore survival in soil |
| |
Authors: | J Fargues O Reisinger PH Robert C Aubart |
| |
Institution: | 1. Université de Nancy 1, Laboratoire de Microbiologie, Médicale et de Microscopie Electronique 54019 Nancy, France;2. Faculté de Médecine, Laboratoire de Biologie Médicale et de Microscopie Electronique 54019 Nancy, France |
| |
Abstract: | The survival of naked and clay-coated Beauveria blastospores in soil was investigated with an experimental biodegradation method using a trap technique. At various times of incubation, traps were collected to study changes in biomass, inoculum potential, and infection potential of degraded blastospores, and to investigate the colonization of blastospore biomass by antagonistic soil-borne microorganisms. Infection potential was tested on larvae of Plutella maculipennis and Leptinotarsa decemlineata. Naked blastospores were inactivated after 3 weeks incubation, while clay-coated blastospores were still active after 2 months incubation in soil at 20°C. All investigations demonstrated the protective role of clay coating against biodegradation of fungal propagules by soil bacteria and protozoa. Consequently, clay coating of blastospores is proposed for the formulation of entomopathogenic hyphomycetes propagules. Moreover, antagonists implicated in lysis of blastospores, must be considered as an important part of the environmental response to a massive introduction of a fungus used for insect control. |
| |
Keywords: | biodegradation clay-coating entomopathogenic hyphomycetes propagules |
本文献已被 ScienceDirect 等数据库收录! |
|