I Have A Julie Mango That Has White Patches On The Trunk And The Leaves Do Not Look Healthy

Answer 1

White patches can be powdery mildew, but I would expect that to be on the leaves, not the trunk. There also is a white scale that likes mangos. Another possibility is tree lichen, which is harmless.

Here is a group of articles on mangos that may help:

https://www.gardeningknowhow.com/edible/fruits/mango

https://www.gardeningknowhow.com/edible/fruits/mango/mango-tree-diseases.htm

https://www.gardeningknowhow.com/ornamental/fungus-lichen/treatment-tree-lichen.htm

https://www.gardeningknowhow.com/edible/fruits/fegen/fruit-tree-lichen-and-moss.htm