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I fail to see how this can be classified as Organic, but then its a slippery term, i think we can agree on this. Sulfur is a widespread, non selective fungicide, which for me means its not on the table.If you don't have any luck w the milk or other suggestions there is an organic approved fungicide called Kumulus it's a sulfur concentrate. I'll spray it one time before flip and never see pm. I've also used it on contaminated babies I've got from friends. Just go very light:D
Far easier to use a media that has base O2 of 6ppms, a canopy temp of 25c or below, a consistent soil moisture of 40-60% and or soil which has been treated with for example, pseudomonas fluorescens or the above mentioned bacillus
http://www.sciencedirect.com/science/article/pii/S1049964409002382
get the room right, never get the mold problem.