I wouldnt worry about killing the micro herd... they live in the ground for the most part... unless you've been spraying organic teas on your plants... in which place those should help prevent "bud rot" aka
Botrytis
I assumed you have used some technique to prevent mold and you would still found some mold from your plant. For example if plant is injured it might get some mold in it. After killing the mold with H2O2 you should spray your plant again with organic tea.