Good point on the fertilizer feeding the fungi. You reminded me of something whenever I took a cultivation class once and the teacher mentioned that nitrogen will cause the hyphae to “grow” quickly. I think he said that too much can cause the fungi to basically explode. He was taking about growing in a controlled environment for the most part so, I wouldn’t think that excess nitrogen would actually kill off the fungus in a natural setting. I’m thinking too many variables.Airspade that shit, backfill with composted wood chips and perhaps add some myro. Don't forget to water, and cross your fingers and toes.
Fertilizer will just feed the fungi more...
Are there any known root rot pathogens besides fungi? Just wondering.Excess inorganic fertilizers (salt...) Can absolutely kill some soil microorganisms. Most of which we have little to no understanding of.
Another posibility is the the soil becomes so fertile that the tree no longer has a mineral need for symbionts such as mycorrhizea and the relationship is ended. This can open up the tree to potential root rot pathogens as the fungi are no longer there to out-compete the bad guys. Another negative could be increased drought damage as I believe at least some mycorrhizael fungi also have a role in water uptake
Feed the soil, don't "feed" the plant.