There are a number of different options out there for plant fungicides. However, some of them are definitely better than others. First of all, many of them contain toxic chemicals and can only be used during certain parts of the growing cycle, or can only either prevent or treat the problem, not both. Most of the options are also off limits for those who want to have organic certification for their crops. There is one product that doesn’t have these problems though, and that is Oxidate. You don’t even have to worry about mutational resistance with this product, so it is a good all around option to try.