white mold

Once I buy a pack of vermicompost, white molds develop inside the pack within a few days. Should we treat them with something, or just let it be there?

Hello everyone. I just found out about the community after googling for white mold help. I know I'm a newcomer so I hope someone could share some advice. I recently got a beautiful matsu. But on the last two weeks I noticed white mold growing on its branches through the whole tree. Is this...