Okay, here is the best way to PREVENT mold.
1.) Do not water the tops of your plants once bud colas are developed.
2.) If outside, cover them with a greenhouse film to prevent night rain.
3.) Do not water two days prior to harvesting (let the soil dry out)
4.) Once harvested, cut the main fan leaves off and hang remainder in a dark DRY room for 10 days or so.... branches should start to SNAP. (Save stems and fans for making hash if you wish)
5.) Do one more trim of smaller leaves and add to hash mix box (optional)
6.) Cut buds close to the stem and fill mason jars. (do not pack too tightly). Store in a dark room. (if your jars are sealed the humidity of the room is not important.
7.) Check on your stash every 12 hours or so for the first three days, open them and breathe deeply. this does two things, it mixes the air inside the jar and lets you smell bud rot. Bud rot will have an ammonia smell to it.
8.) After three days you can change air once a day. In two to three weeks you will have some sweet buds.
9.) Repack your stash once cured more tightly. You can now freeze your weed in mason jars for a year or more. It will age like fine wine.
If you have mold, cut away as best you can and repack....keep smelling the stash, that'll tell you. And yes they reproduce via spores.
Hope this helps....
out.