What is this white stuff on mulch and stump?
I need help identify what this is. There is white stuff appearing on mulch that surrounds my lemon tree. This area has become hard and compacted. Here's one shot with a second one that is a closer look (the best I can do). About 2 feet away there's a monterey pine tree stump - the tree was cut down a year ago, and now white stuff is appearing on its sides and top. Here are all the pictures. My questions:
1) Do you know what the white stuff is?
2) Are these white stuff related?
3) How to treat it?
We do want to get rid of the stump, but have not had time or resources to do it so we've left it alone for now. - Amy