Today, one HC has developed some white mold around a node below the tip.  Besides removing it from the humidity chamber, what suggestions to do from here?  This is my first experience starting cuttings so I am clueless as to what I should do.  Thanks for any suggestions.

I'd have this happen occasionally to me while in the humidity bin.  I simply scratched the mold away and it would eventually stop molding.  I never applied anything to the spot to prevent further development.  I had so many cuttings going at one time, that I had the 'do or die' attitude towards a cutting.  You should probably wait for a better response as mine isn't very scientific.   ;)

Keith, great question. I had similar concerns.

Rich- thanks for your clarification. It helps us newbies.

I always keep a soft toothbrush handy and when I see mold I just gently brush it off. I haven't caused any damage on any cuttings so far (knock on wood)... Oh, and of course I clean off the tooth brush every time I use it...

Thanks everyone.  I did a search first before posting the question but this recent information is very helpful.  I am using RichinNJ's humidity chamber method and the other cuttings are just now pushing out small leaves in 11 days (carini and celeste) and wasn't sure if there was anything I should do to protect them.  I removed the HC from the chamber and have it on a heat mat just to see what happens.  Thanks again.

Correction:  The cutting with the white mold is not a HC but a celeste that was put in the chamber on December 5th.

Dirtguy50,
A 3% Hydrogen Peroxide / water solution sprayed on the cuttings after the fuzz is brushed way, along with increased airflow. 1 part peroxide / 3 parts water (25% peroxide / 75% water) is used to mist the cutting surface. Good Luck.

Thanks Pete.

I've seen mold kill cuttings.  I get rid of it with bleach, peroxide works, some people use physan 20.  As Pete said, increase airflow.  If I have mold in a closed space I spray all the cuttings and the container.  I make sure to cut off any pant parts that are dead - nodes, stem, leaf bases, etc.  They will just mold again.  When I spray I don't let any get into the soil.  One advantage of H2O2 (peroxide) is that it turns into water so it doesn't put excess salt or toxic chemicals in the water.  One disadvantage of H2O2 is that it turns to water and too much water is also bad for the soil and it contributes to mold growth.  Which is why Pete wisely increases his airflow.

Pete, why do you dilute your H2O2?  The 3% we can buy at stores is pretty dilute already.

Bob C,
It causes less damage on new emerging leaves. Undiluted will kill young plant cells.

Stopped having mold with the deletion of humidity covers/bin.  See no need for humidity but my cuttings are buried except for a few and those are swelling buds now, the ends are waxed. I suppose in very dry conditions the covers may be necessary.  I would like for some others to try no covers and see how it goes for them.  Just keep your mix moist. 
 

Keith, 

I had a similar problem a few weeks ago. Mold was starting to form on some of the cuttings and I didn't want to lose them. I wiped down the entire exposed part of the branch with a 3% hydrogen peroxide solution and a paper towel (I did not cut the peroxide with water). The mold has not returned and the the cuttings are doing great. 

Thanks Ogorodnitsa (that's a tough one to type LOL), I decided to use the hydrogen peroxide 3:1 dilution by spraying the potted cutting.  It was planted in perlite about a week ago, so I didn't want to pull it out so just wiped what I could and then sprayed the diluted solution.  Just as a precaution, I took the other potted cups out and washed the chamber and sprayed it and the cuttings and then reassembled the chamber.  That is encouraging it worked for you.  Thanks.