You need to get yourself a good antifungal spray and wait until the sun goes down then go out and spray it on do not do it while the sun is on the plants the sun will burn the plant with the spray.
Baking Soda works very well in defending fungi. Dilute 2 Teaspoons in 1 gallon (ca. 4,5 Liter water). and spray your plants with vaporiser. If possible, additionally try to reduce air moisture to max. 65%.
The best way to get rid of plant fungus is to use the spray Bacillus Thuringiensis. The spray itself is a sort of bacteria that is not poisonous to anything other than fungus. It is therefore safe to use around children and pets.
Ortho antifungal spray is the best thing I have found for it and it doesn't take it long to get rid of it either. But make sure you spray it after the sun goes down in the evening otherwise you will damage the plant and it won't kill the fungus.
