Plant Health

The first thing I would try is hydrogen peroxide. You can get it at Walmart, Walgreens, CVS, even the supermarket, in the drug - health care section. Peroxide is light sensitive so it's in a brown bottle. You don't want to mix up a big batch of it for it will degrade rather quickly. Get one of those spray bottles that hold about 32 oz of liquid. I know Walmart has them, I think their in the housewares dept. Their like the ones that awesome cleaner comes in. Start with 1 tablespoon of peroxide in an almost full bottle of water. If it is sunny out, do your spraying in the morning, before 11 AM or in the evening after 6 PM. If it is not sunny it does not matter. I would spray just one section of leaves, then wait one day to see if it harmed the leaves at all. If it didn't then spray the rest of them, tops and bottoms. if they show any signs of distress, like browning, curling or discoloring then try 1 teaspoon in the spray bottle of water. I really don't think there will be a problem, but you never know. After 4 or 5 days check to see if spots have increased or stopped forming. If they have increased spray them with a 2 tablespoon mixture, you can probably go as high as 7 or 8 tablespoons per spray bottle of water. If they have stopped increasing, spray them again with the 1 tablespoon mixture or what ever mixture worked. Always make a new mixture unless you are going to use it the next day. If this doesn't work the next thing to try will be a sulfur mix.