You can't grow mycorrhizae in compost tea. They are species of fungi and the spores need to be near the roots of a living host plant before they will hatch, attach to a root, grow and reproduce.
That is how Mycorrhizal innoculants are produced commercially, they are grown on plant roots, harvested and the propagules are separated. Propagules are viable spores and mycelium (fragments of mycorrhizal roots)
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