It could be true if you were in a riparian area of Texas where Pecan grow naturally that the specific species of Ecto Mycorrhizae could be air born and therefore capable of inoculating a tree.
However I’ve personally seen orchards in that region of Texas that did not have a mycorrhizal infection and suffered nutrient update inhibition. Once we inoculated the trees with the proper species of mycorrhizal fungi the trees rapidly begin to benefit from the infection.
In working with a company in Mexico that has the majority market share in agriculture for the distribution of fertilizers and biomimetic materials such as mycorrhizal products, we’ve seen the same thing.
I recall a conversation with a pecan grower in Texas about 15 years ago while I was attending the Texas Organic Farming conference, where the grower noticed that trees across the road from his orchard growing in the nearby river flood plain did not show zinc nutrient inhibition. He was curious why his trees had this p…