Even with trichoderma as your only added microbe, YMMV with
fusarium. A member on here from somewhere in one of the
mid-Atlantic states tried RootShield, which is all trichoderma
harziana, to treat garden soil with chronic fusarium problems.
She was not impressed with the results, IIRC.
Remembering what greentiger87 said about "selection factors",
if a soil selects strongly for fusarium and and not so strongly for
or even actively selects against trichoderma, the fusarium is
simply going to outcompete it in that soil.
I have used bucket-bubbler brewed compost tea before. I was not
particularly aiming to treat disease. I looked at it as simply a kind of
"plant food". I gave each plant in a short row about half a gallon
in a soil drench. They put on a nice growth spurt over the next
week.
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