Quick search of Youtube before I head off too sleep.
Here is a guy who started using Hydrogen Peroxide on his plants. He is easing into it because he did a video five years earlier using full strength 3% and burned his plants.
At roughly 14:30 minuets in. He starts to show some leaves with holes in them where the leaf spot used to be. This is his second video. In the first video he shows his plants with lots of up close shots of the leaves. Classic leaf spot with a brown center surrounded by yellow. After a number of sprayings the brown spots are now gone and holes are left in their place. This guy is a long time gardener with a public reputation. He is not being paid or sponsored. He did this totally wrong five years ago and damaged his plants. That video is also on Youtube. He is not going to blow up his YouTube channel by steering people wrong. He is totally up front. This is not a single application thing anymore than taking antibiotics is. It takes multiple doses. It is not to be used with other anti-fungals. Though I have seen it used with 1/2 to 1 teaspoon BlackStrap Molasses along with the 3% Hydrogen Peroxide per cup of water as a sticking agent with good success. Which helps with leaves that are glossy or waxy.
Keep in mind. 1 Tablespoon 3% Hydrogen Peroxide in a maximum dose. And this video with this guy that came up on my quick search is using much less than that with very good results outdoors.
How to Use Hydrogen Peroxide in Your Vegetable Garden: A Full Experiment & MIx Ratios
https://www.youtube.com/watch?...
