can i suggest in between your cgws spray you spray EM-1 (EM = Effective Microorganisms ) pathogenic fungus in general likes a more neutral to alkaline PH , EM is a much more Acidic solution with around 15 beneficial organisms , the acidity will help stop the fungus from taking hold & the beneficial organisms will out compete the negative organisms , make a solution of 1.5 to 2 milliliters to a liter of water preferably rain water to avoid the chemicals added to tap water , spray early in the morning or late in the day to avoid spraying in direct sunlight , you can also make your own lactobacillus solution at home which will have a similar effect to fungus on leaves but it won't have the consortium of organisms EM-1 contains
