Crabill, C. H.2015-11-132015-11-131913http://hdl.handle.net/10919/64007[25] leavesapplication/pdfen-USCreative Commons Public Domain Mark 1.0LD5655.V855 1913.C722Leaf spotsPhyllosticta pirinaConiothyrium pirinumApples -- Diseases and pestsStudies on Phyllosticta and Coniothyrium occuring on apple foliageThesis