Thats too much. There is of course no one fungi. And my garden is not mutagenic. And they already exist as specialist in what they eat. And yes given a food source they can exist even indefinitely like the aeroponics globes people seal plants into. I just overfed, and was killing the garden with too much love.
You must realize the new gardener also did not realize how low his garden was, or what the water level in his poorly percolating clay would do, or what fun would grow out of high protein fertilizers covered in sugar. There had to be other combined factors of course. And in this case, I am very close to a hardwood litter covered hill, which will flow its leachate into the garden area during heavy rain periods. All of this and a few spores of something like scytinostroma galactinum and it is over. Now we plant in hill row, have dry soil surfaces or hay etc but not back then. I still use molasses today. I have a 25 gallon sprayer that I will mix 1/2 gallon into, it takes 2 trips do do my whole yard.
Which reminds me, have you used the deer molasses sold by tractor supply? Its by Evolved Habitats. It has a slight amount of propionic acid in it, which breaks down into other acids or perhaps you know of a nuetralizer? My lawn soil is usually an 8ph or so because we live in limestone central so acids should not be that big a deal but I am not that familiar.