Some nematode spread by a moth. Attacks the roots I believe.
Its hard to treat trees. Their circulatory system is primitive, doesn't circulate much, is anisotropic. So not much leverage to apply treatments even if they existed.
I don't know much about plants but have resolved health issues of my own that doctors said couldn't be resolved. I read a book some years ago with a true story in it about a man in a village saving a fruit tree by starting an ant war. The tree was being destroyed by an infestation of (I think) large red ants. The villager kept bringing leaves with black ants to the area. Even though the black ants were smaller, they eventually won and the tree was saved.
So I'm wondering if you can research natural predators/enemies and import them to kill off the nematodes?
The other thought that occurred to me: I am wondering if you can get the soil tested and if there is some way to determine there is a nutrient deficiency that could be remedied. Again, I don't know much about plants so that I don't know where you would need to go to get info like that. But my best understanding is that a nutrient deficiency can compromise an immune system. Alternately, a high availability of something desired by the predator can attract them. So I am wondering if that would be a helpful approach.
