I am volunteering in Italy for a man with a hillside farm and orchard. He has had increasing interest in permaculture over last 30 years and always trying new things. There is a peach tree in the orchard that gives wonderful fruit but he claims that it will only produce with a heavy chemical treatment. There is a fungus in the area that attacks the leaves and decimates its production. For all my research I can't find an Eco friendly answer. Anyone with some tips or references would be greatly appreciated. I'll try and post some pictures of the infected leaves soon for identification. Thanks!
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