CONTENTS. 



Introduction 



Environmental diseases 



Smoke and sulphur gases 



Unfavorable soil conditions 



Extreme cold 



Injuries caused by animals, wind, etc 



Diseases caused by miscellaneous parasitic and saprophytic organisms 



Diseases caused by insects 



Diseases caused by parasitic higher plants 



Diseases caused by miscellaneous fungi 



Mildews 



Tar-spot 



Rusts : 



Sycamore leaf-blight - u 



Leaf-spots 



Leaf-blister fungi 



Nectria cinnabarina - ' 



Chestnut bark disease 



Root-rots 



Slime-flux diseases 



Diseases caused by wound fungi 



White heart-rot caused by Fomes igniarius 



Nature of disease caused by Fomes igniarius 



Susceptibility of different hosts to the white heart-rot 



Distribution of Fomes igniarius 



Description of the fungus 



Spread of the disease 



Influence of environment on prevalence of white heart-rol 



Ultimate fate of diseased trees 



Effect of the fungus on the wood structure 



Preventive measures 



Red heart-rot caused by Polyporus sulphureus 



Piped-rot of oak and chestnut 



Soft rot of oaks caused by Polyporus obtusus 



Heart-rot caused by Fomes nigricans 



Disease caused by Hydnum erinaceus 



Black locust disease caused by Fomes rimosus 



White heart-rot of ash caused by Fomes frarinophilus 



Red heart-rot of birch caused by Fomes fulvus 



Soft heart-rot of catalpa caused by Polystictus I < rsicolor. . . 



Heart-rot of oaks caused by Fomes everhartii 



White-rot caused by Polyporus squamosus 



Two sap-rots 



Decay caused by Fomes fommtarius 



Decay caused by Polyporus betulinus 



