44 U.S. DEPT. OF AGRICULTURE MISC. PUB. 939 



Host, family, and genus Pathogen Symptoms Continents 



Pinaceae: 



Abies Arceuthobium campylo- Witches'- N.A. 



podum. broom. 



Phomopsis pseudotsugae Canker Eur. 



Poria weirii Rootrot__ N. A., Asia 



Rehmiellopsis balsameae Needle N.A. 



blight. 



Cedrus Clytocybe tabescens Root rot___ Do. 



Peridermium cedri Witches'- Asia 



broom. 



Larix Dasyscypha willkommii Canker Eur. 



Helicobasidium mompa Root rot__ Asia 



Mycosphaerella larici-lepto- Needle g Do. 



lepis. cast. 



Physalospora laricina Shoot Do. 



blight. 



Poria weirii Root rot _ _ N.A. 



Picea Arceuthobium pusillum Witches'- Do. 



broom. 



Chrysomyxa arctostaphyli.^ do Do. 



C. deformans Needle Asia 



rust. 



Helicobasidium mompa Root rot __ Do. 



Poria weirii do Asia, N.A. 



Scleroderris lagerbergii Canker Eur. 



Pinus Arceuthobium americanum - Witches'- N.A. 



broom. 



A. campylopodum do Do. 



Atropellis piniphila Canker Do. 



Cenangium ferruginosum Dieback Eur. 



Cercospora pini-densiflorae. Needle Asia 



blight. 



Clitocybe tabescens Rootrot__ N.A. 



Cronartium comandrae Canker Do. 



C. flaccidum do Eur., Asia 



C. fusiforme do N.A. 



C. himalayense do Asia 



C. quercuum Gall N.A. 



Elytroderma deformans Needle cast Do. 



Helicobasidium mompa Root rot- _ Asia 



Hypoderma lethale Needle N.A. 



cast. 



Hypodermella sulcigena do Eur. 



Melampsora pinitorqua Canker Eur., N.A. 



Peridermium harknessii Gall N.A. 



P. stalactiforme Canker Do. 



Phacidium infestans Needle Asia, Eur., 



blight. N.A. 



Phomopsis pseudotsugae Canker Eur. 



Phymatotrichum omnivorum Root rot N.A. 



Poria weirii __ do Do. 



Scirrhia acicola Needle Do. 



blight. 



Scleroderris lagerbergii Canker Eur. 



Pseudotsuga Arceuthobium douglasii Witches'- N.A. 



broom. 



Phomopsis pseudotsugae Canker Eur. 



Poria weirii Rootrot__ N.A. 



Sequoia Phomopsis pseudotsugae Canker Eur. 



Tsuga Arceuthobium campylo- Witches'- N.A. 



podum. broom. 



Phomopsis pseudotsugae Canker Eur. 



Poria weirii Rootrot__ Asia, N.A. 



Platanaceae: 



Platanus Ceratocystis fimbriata Canker N.A. 



Helicobasidium mompa Root rot __ Asia. 



Phymatotrichum omni- __do N.A. 



vorum. 



