Ive never seen ants attack a tree.
Well... I did in Peru, i saw leaf-cutters, but i think the tree was dead anyway
and i dont have leaf-cutters here in New Orleans.
When you say white bugs, i am thinking mealy bugs maybe, which ants will harvest
and raise (kinda like cattle) for food. But usually, the mealy bugs are on the young leaves.
Snails can attack leaves of some species, but if you dont see holes, or chew patterns, im not sure what they would be hurting. Ive never heard of snails attacking roots.
If you havent already done so, you can inspect the undersides of the leaves closely for pests.
Some people might look at all that life in the soil as a good thing.
all those critters create a waste stream (free fertilizer)
that waste stream is attacked by bacteria and fungi.
As long as that stays aerobic, those microbes are good for the soil.
Would you know what kind of soil was used in the mix ?
Do you know if it maybe root bound ?
i have 2 Cherimoya. I recently put 1 in the ground
I do remember thinking there were more roots than i had expected
Its planted on a raised area, and the one in the container doesnt have any peat moss
i never use the stuff, i dont like it at all. - So, i cant speak to that
The one in a container is mostly sand and compost. it drains rather well.