you very well could have brought in some pathogens with those fifty truck loads of wood chips.
My first thought when people are worried about fungi in the garden is that it's an example of fungi/microbe paranoia that our society has and that it's probably fine UNLESS they brought in a bunch of wood chips from certain sources.
I knew a guy who had all kinds of wood chips dropped off at his place for free but not from reputable mulch suppliers. he all of the sudden had honey mushrooms growing all over his land. They are the only edible mushrooms that is also a plant pathogen.
It is likely that the tree service he got them from was chipping trees that were being cut down because they were diseased. He made a deal with them They They could dump chips at his place. Might not have been a good idea.
Sounds like dog commit and inky caps though, but do keep an eye on things.
No, endomychorizal fungi do not form associations with all plants. Some associate with endo, some with ecto some with both very few do not form associations with either.
it is also not likely to work well as inoculum, but will have a short lived effect.
You will notice that mushroom cultivation don't buy bags of inoculum to grow mushrooms, and that is because that's not at all a viable way of growing fungi.
The product itself, depending the product, may contain enzymes and beneficial compounds that were produced by the fungi in the ideal laboratory conditions. If so those enzymes etc will have a short lived effect that you notice that makes you think that it is working, but it doesn't.
Fungi and bacteria are very specific to conditions. And if they are viable by the time you ad them to your soil, and if they germinate they will likely get devoured and/out competed by wild strains. Like you said there is tons of wild competitor strains already visable that will fight your lab grown stuff for the space and nutrients.
But chances are it will not even work.
Oregon state has done several studies on several occasions through out the year on all of the top microbial products. Some are well known, all from well known manufactures and found that they can not usually detect any viable spores or cfu's in the products, and when they do have viable spores or CFUs it fall well below the label claim. Way below; They may detect 100 where the label claim is 10,000,000 per cc.
I can't actually post the pdfs I have from Oregon's Ag dept but I can post a link to a search page that should have a few of the paperwork their test results.
Most people I've shown found it disturbing but as a mushroom cultivation and natural farmer I found it as validating because I've always said that there is several reasons they won't work.
I've also run my own best on a few different products by trying to culture the organisms in the product. The ones that did work were week, very week and could never make it in the wild except for strains of the bacteria bacillius I grew from a couple products, mosquito dunks was one of the products, and I think the other was another strain of bacillius from the brand "safer".
It is the second link on the list that is not a sponsored link.
https://www.google.com/search?client=ms-android-verizon&espv=1&ei=2z1XW_DrGOe_0PEPwt6wsAQ&q=oregon+state+dept+of+agriculture+microbial+analysis+results&oq=oregon+state+dept+of+agriculture+microbial+analysis+results&gs_l=mobile-gws-wiz-serp.12...24342.28350..30153...0.0...143.946.1j7......0....1.........0i71j33i22i29i30j33i160j33i21.3DC3H_4BE0c
sorry everyone but results don't lie