I have over 20 fruit trees and the only one with a problem is my LZ mango, has aphids like crazy that I can’t control and many other things. Lost my whole crop to anthracnose and a hail storm. I grow all trees organically except my citrus that I fertilize organically but I give them Bayer citrus systemic treatments. My city checks on them regularly and will uproot them at first site of issues. Is it ok to use this systemic poison on a mango tree? Those mangos are so good I want this tree to work out.The trees are well cared for, heavily organically fertalized, foliage sprays and bugs or leaves picked at first sign of issues. This tree has so many issues I can’t keep up. I can’t do permaculture do to my neighborhood. If any other suggestions please let me know.