pure white mold on bottom of trees

Question

After an extended period of rainy weather (10 days straight), a maple tree cut down a few years ago along with a live tree now have a thick coating of white on the button of the trunks. It seems to have appeared overnight. Any ideas what this is and what to do about it?

Answer 1

In most cases, this is just the beneficial fungi in the soil flourishing... When you see black or green... then you can worry.

For now, I would recommend applying dolomitic lime and wettable sulfur, just to ward off any infections that are prone to thriving in wet weather. Otherwise, there will be no action needed.