The relation of bark moisture to the development of canker diseases caused by native, facultative parasites. VI. Pathogenicity studies of Hypoxylon pruinatum (Klotzsch) Cke., and Septoria musiva on species of Acer, Populus and Salix

Forest pathologists in many countries are considering the serious problems that may arise through the movement of internationally dangerous diseases from one country to another. As a preliminary step in facilitating this program, Riker (9) as a member of the working group on Foreign Tree Diseases in Section 24 (Protection) of the International Union of Forest Research Organizations has consulted with forest authorities in 16 countries