Here in the mountains of western North Carolina the eastern white pine is a dominant forest tree. Sometimes after a heavy rain (it has been raining here most of this week-end) a white bubbly foam, like soap suds, will appear at the base of some of the pines, as though it is exuding from the bark. It disappears after the rain ends, and doesn't seem to appear during drier weather. I haven't seen any obvious holes in the bark that might suggest beetle infestation, but I'm not an expert. Does anyone have any idea what this might be? Should I worry about this, or is it just a harmless natural phenomenon? Thanks for any thoughts or opinions. Sorry I don't have any pictures. Probably I should enter the 21st century and get an appropriate camera.