Disclaimer: This post was originally posted by Newbie, jeaninemyatt. This was originally posted on July 3, 2014.
I have found a recipe for fungus, also for preventive used weekly. 4 teaspoons of baking soda, 1 teaspoon of liquid dish detergent , dawn or ivory, mix into 1 gallon of water. Don't shake just swirl to mix. Put in spray bottle and spray leaves if already infected spray daily, will take up to 5 days to really see improvement. Was looking about zucchini but said also good for cucumbers. I haven't had to try it because also read that if pattern on zucchini than that is the norm for the type of zucchini I have. Had googled "spots on zucchini leaves" and found this.