mildew (or something) on cuttings

Hi, folks,

have gotten many cuttings started in the greenhouse. They’re in bags because I can’t keep the humidity up in the greenhouse when outside the humidity is only 12% (my pasture crunches when you walk on it…). Unfortunately some of the cuttings are growing mold/mildew/stuff. Is it okay to use something like Safer on them? Or are they too delicate? Anything you guys would recommend?


Cornell mixture may help.