Hello,
I have some dogwood sprouts that i planted earlier this spring, and last night, i noticed one has developed brown spots and wilty leaves. I'm fairly new to bonsai (been trying various plants for about a year) and don't have a great eye for diagnosing problems yet. Can anyone help identify what's going on here?

Thanks!

This looks exactly like what you get by fungus infection, roots too wet or infected soil with repotting. Sapwood gets clogged by the fungus, resulting in unevenly browning.

thanks! i repotted it last night (it was in a smallish pot with other sprouts, so had to be repotted soon anyway) and the roots looked healthy, so hopefully it is just a fungus....any recommendations for a good fungus cure?