Volume 16 Part 1 Article 59: Etiological Aspects and Treatment of Janthinobacterium agaricidamnosum in Agaricus bisporus

Volume 16 Part 1 Article 59
Year 2004
Title: Etiological Aspects and Treatment of Janthinobacterium agaricidamnosum in Agaricus bisporus
Authors: B. Desrumaux, P. Sedeyn, J. Van Vaerenbergh, M. Demeulemeester and A. Calus

Abstract:

In response to a severe soft rotting disease occurring on commercial mushroom (Agaricus bisporus) farms, the Belgian Mushroom Research Center carried out a study on the etiology and epidemiology of the disease. The causal agent was identified as a bacterium, Janthinobacterium agaricidamnosum sp. nov. Experiments were performed to determine those factors that were important in the development and control of the disease. Studies were carried out in which the bacterium was introduced into spawn-run compost, on the casing soil after casing and during pinning. The spread of the pathogen by watering, air currents and direct contact also was examined. Changes in the attraction of mushroom pests by symptomatic mushrooms were explored as well. Finally, we evaluated the use of sodium hypochloride and formaldehyde to control the disease. We concluded that symptoms occur, irrespective of the time of infection, between the pre-harvest period and first flush. The bacterium was easily spread by watering and direct contact. The traditional use of sodium hypochloride in the irrigation water was ineffective against the disease.

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