Detection of Intraspecific variation in Botrytis cinerea and in vitro biological control by compost extract.Objectives: The present study was on intraspecific variation detection in B. cinerea and the effect of a municipal solid waste compost extract on two stages of its life cycle. Methodology and results: tomato leaves were inoculated with 22 strains of B. cinerea to select the most virulent. They were transplanted into culture medium based on compost extract to assess the growth and sporulation. B. cinerea strains isolated from tomato plants proved to be more virulent. Growth and sporulation of five strains selected were inhibited by the extracts in the media by 95.24% and 100% respectively. Conclusion and application of research: The study of pathogenicity of B. cinerea showed the existence of intraspecific variation. The sterilized compost extracts efficiency on B. cinerea in vitro proves that chemical compounds are involved and suggests the possibility of using these extracts and compost in vivo against tomato gray mold. Mouria et al.… J. Appl. Biosci. 2013. Mise en évidence d'une variation intraspecific chez B. cinerea et ce lutte biologique in vitro.
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