Hello, I have a 15 acres organic farm in the Pacific coast of Nicaragua. I have over 500 young mango trees (4-5-6 years old). Many of them have lots of black spots in the trunks, and on the leaves some of them have little black spots as well. For what I read, it could be the fungus Alternaria alternataor or the bacteria Xanthomonas campestr. I have been looking for a permaculture-organic way to deal to be able to heal my tress, and I can not find it! Any help PLEASE will be greatly appreciated!!!! Feel free to write me back to gabrielaprado2003@yahoo.com Namaste, Gabriela