i am dealing with the same issue , I was low on funds but needed to adress the issue before it spread, so at home depot i grabed a product from ortho called ecosence brand (garden and disease control) there are a few differt kinds but i always go with the stuff that is safe for fruits and blooms (active ingredient/ copper octanoate) i tested it first on a new clone cutting and no effect on plant health but did kill the mold , so i tested on a hairy little bottom bud to see if hairs would be damaged , nope plant didnt mind the spray so i went to town and things are looking awesome even after a drenching , and the stuff was 5$ so as far as things go for me best 5 bucks i spent in years