Hello all,

 I am a newer member and love this forum,Its very informative especially to a newbie like myself.I have not posted any questions because the majority of the time If I look around you guys usually answer my question,that being said Im having a problem with mold,I have some rooted cuttings in cups with bottles over them for a green house effect,Ive noticed mold on my cuttings.Im in zone6 RI and leave my cuttings in the front enclosed unheated porch,the temps fluctuate between 50 to 80 degrees on sunny days should I take the bottle off during warm day?Any reply would be greatly appreciated.

Regards
George

Mold seems to be a function of air, more than anything else. Try leaving the bottles/covers off for a couple hours each day, and or put the cups in a much bigger enclosure which will obviously have a larger volume of air.

I started rooting my cuttings in a greenhouse this season, rather than the packing crates I was using and haven't had a moldy cutting yet. This tells me that the larger volume of air is helping. This is still an experiment, but seems to be working so far.

had a problem with mold on a few cuttings that i had in the baggies.. If the cutting was to far down in the bag it had issues with air circulation and would mold... These bags were the seal a meal bags with potting mix in them.. The 1 gal. zip lock bags that I was air rooting cuttings in would mold.. I then started every 3-4 days removing the air inside the bags and blowing them up again no problems since i started reinflating them in this manner.

Are the cuttings rooted yet?  If they are I would remove the bottles because if you have mold growth on the stem, then the leafs may not open.
As stated above, dry air will reduce mold growth.

Weird, I leave mine in the bag with no air, and I typically don't see mold.

I learned to blow them up to add more air, and to "change the air periodically.

See http://figs4fun.com/basics_Rooting.html