White Trunk

Question

my pussy willow trees bottom half of the trunk is white now instead of brown

Answer 1

It's tough to know without more information, but I suspect you have a powdery mildew problem.

Here's an article that will help you deal with it: https://www.gardeningknowhow.com/ornamental/trees/tgen/powdery-mildew-on-trees.htm

https://www.gardeningknowhow.com/ornamental/shrubs/pussy-willow/growing-pussy-willows.htm