Botrytis (grey mould)
During mild, humid conditions, especially if the plants fill out and are not picked regularly densly planted chard could develop grey mould on the outer leaves of this crop. Remove and/or thin out the chard leaves to allow better air flow within the rows and to reduce the densly packed plants.
There is no product available to control this fungal problem. Changes to the crops growing conditions and environmental conditions has a direct effect on the severity of this fungal problem.