Hi Doc,
I have a Ponderosa pine that I got from Elandan gardens nursery. It is supposed to be l50-200 yrs old and was collected in the mountains. Sooo, I'm very worried about it. About 3 yrs ago when it was a warm wet winter, my tree got covered with a black sooty mold. I immediately sprayed it with a fungacide and it killed the mold but left a gray chalky look to the bark and now anytime it gets too damp it flares back up again and I have to spray again. It hasn't flared up in about a year cuz I've been real careful not to let it get damp. How do I get rid of the gray chalky stuff on the bark without damaging the bark or killing the tree? I've considered a light solution of lime sulfur and a soft toothbrush but am too afraid to do it without someone elses opinion that has more knowledge than me. I'll attatch a photo but you can't really see the chalky look
in the photo.
