Volume 17 Part 1 Article 36: Influence of Organic Acids on the Growth and Development of Trichoderma aggressivum a Pathogen of Agaricus bisporus

Volume 17 Part 1 Article 36
Year 2008
Title: Influence of Organic Acids on the Growth and Development of Trichoderma aggressivum a Pathogen of Agaricus bisporus
Authors: D.M. Beyer, K. Paley, J. Kremser and J. Pecchia

Abstract:

Previous research has shown that composted substrate for Agaricus bisporus prepared under low oxygen conditions resulted in earlier and more severe development of Trichoderma aggressivum (var. Th4), the pathogen causing green mould disease on mushrooms. Organic acids are known to be produced under anaerobic conditions, and these residual compounds may be involved in the development of the pathogen in mushroom substrate. This research looked at the influence of several organic acids at different concentrations on the growth of T. aggressivum. Results suggested that in vitro higher concentrations of most organic acids had a negative influence on the growth of the pathogen while lower concentrations of selected organic acids stimulated growth. In vivo assays suggested that when some of these acids were added to the substrate at low concentrations the substrate was predisposed to disease development. Disease development was quicker and more severe in composted substrate treated with different organic acids and at different concentrations of these acids. The results suggest that anaerobic conditions during the composting substrate preparation will predispose the mushroom crop to Trichoderma green mould disease.

Please login to download the PDF for this proceeding.