There has been a white growth on the bases of my pecan trees that has me concerned. We've had a very rainy month. I wonder how concerned/worried I should be. (I suspect: very). I need to post a picture but I have to figure out how... thanks to anyone who can help me identify this. Also, when I was pruning I found black fungal rot running through the heartwood of the branches of several trees and wonder is there is a systemic antifungal that I could use? Thanks!