Question
hi,my question is what is the white fungus on top of the soil.have just started trying to grow bonsai.
many thanks. walter.wrm.

Answer
Hi Walter,

The white fungus is likely a result of your water source and calcium. Are you top watering the tree or soaking the plant? I doubt that it's infected with mites.

Have you tried Googling white fungus on bonsai? You could compare images on the web with your tree to diagnose the problem.

Alternatively, you can upload a picture of your tree to http://www.learning2bonsai.com There's lot of avid bonsai gardeners on the forum to help answer your questions and provide solutions.