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Maybe needs even more ventilation if it's been as mild and damp for you as it has for me over the last few weeks.
Ideal conditions recently-a lot of plants are affected-keep them really dry -remove all infected leaves- increase ventilation and hope for the best
Chemical spray will not help at all really
A good wash out of soap and water and do not leave water in the greenhouse and ventilation in good weather and get rid of any deceased plants .