I'm trying this:  Wrap cuttings with damp newspaper.  Wrap tightly with saran wrap.  Place in zip lock bag.  Place in another zip lock bag.  I get a little moisture in the outer most bag, but nothing in the bag that the cuttings are in.

John, I have changed my methods these days and no longer use  the paper towel method. Now when I root I use a mini hot house then wean the trees out of it. I also now just plant the cutting directly into pots or the ground. Both seems to give great results.

I have used Captan to prevent mold on cuttings and stratifing seeds for years.  It is approved for use on food crops up until harvest.  With mold and many other things, an ounce of prevention is worth a pound of cure.  I dip cuttings before sticking, Japanese Maple scions before grafting, seeds before stratifing, and fig cuttings before rooting in a bag.  I almost never have a mold problem.  Just follow label instructions.  It is sold in nurserys as Captan 50  wettable powder.

Dale

Thanks for the info Dan.

Since discussion is on mold and airflow.
Here is a different example.

My elder hardy chicago planted inground last season and covered in late fall with a temporary plastic portable thats sealed well shows when its humid inside when we get an unusual warm winter day i can see water droplets on all the sides and roof when temps rise.

I notice this single trunk tree will start to turn green from ground level rising up the trunk i quickly open the vents and next day its totally gone.
Airflow works in this case to totally eliminate the green type mold that is newly forming.

If you inflate the baggie with your breath do you think its the extra carbon dioxide that is beneficial?
  Soni

Based on moving them to a larger container (a greenhouse) which has higher humidity, and huge air volume without extra CO2,  am guessing that it is just more volume of air, which lead to "changing" air fairly frequently.

Great topic since it's my first rodeo w/ cuttings. Have seen mold on some and it seems to affect only the cuttings that are from newer growth and somewhat green. I'm using the method of planting the cuttings in perlite in a propagation station under a heat mat and grow light. As some in the forum are saying it's a race
between mold and roots. I would gamble on the fact that a mature cutting will have less mold. Man, did I become a total nerd.