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Cornell developed a strain of [bio]fungus called T-22. I understand that nurseries use this product which is designed to colonize on the roots and keep the bad fungals crowded out.
T-22 is a selection of Trichoderma harzanium, a naturally-occurring beneficial fungus that functions differently from the mycorrhizal fungi I discussed in my article. I plan to cover Trichoderma as well as other beneficial fungi and bacteria in an upcoming article about biocontrol microorganisms.