White mold on canna lily tubers

I just received some canna tubers which had been lifted, dried and stored briefly in plastic. There are small areas with a white mold beginning to grow.
Is there a good fungicide, either natural or chemical, to kill this mold before I store them for the winter?

 

Dust them with Garden Sulphur....very effective fungicide.

Ian

 

Thank you Ian. I was also wondering about a tea tree oil solution, but I don't know if it would damage them.