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Abstract: On all mushroom farms today the measures used for the control of disease constitute an important item in the cost of production. The direct costs of disease control are: 1. Loss of yield 2. Reduced income through poor quality product 3. Loss of quality or yield by changing growing methods to prevent or reduce disease 4. Extra labour costs in removing diseased mushrooms from the crop 5. The cost of labour, chemicals and machinery used for disease control In addition to this there are indirect costs which aim at prevention of disease. These costs include: 1. Filtering of the air for pasteurizing and cropping rooms 2. Steaming out or treating growing trays and cropping rooms 3. Pasteurization of compost and casing soil Thus on modern mushroom farms the question of disease becomes not just a matter of how they can be controlled, but at what cost to the enterprise. The major pathogenic diseases of the cultivated mushroom have been described by Kneebone and Merek (1961), Atkins and Atkins (1971) and by Sinden (1971). In all these pathogenic diseases there is an interaction between the pathogen, the host and the environment.
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