Jeff and Rob, you guys are right. I looked at some of the other mulched trees and only the BKM mulch has the big white roots. The others are darker and very thin and filament like. Must be the various palms feeding on my mango steroids.
Rob, it's a bark guard so the yard crew doesn't kill the trees w/ a weed eater. I have them on all the trees. The white wrap is supposed to a pest deterrent but I have no idea if it works. It breaths and doesn't hold moisture.