ACCIDENTS AND DISEASES 197 



ground from which a crop of Scotch or other 

 pine has been removed, never use the same 

 species. 



Plum. When heavily loaded with fruit, the 

 branches of the plum are apt to get broken. 

 Gumming is a prevalent disease, and insect 

 attacks are frequent. Refer to chapter on 

 the treatment of diseases on fruit trees. 



Poplar is a brittle wood ; large limbs often 

 get wrenched from the trunk in stormy 

 weather. Both fungus and insects are apt to 

 attack the tree when unsuitably placed. Being 

 a comparatively short-lived tree, no great 

 expense should be lavished on repairs. 



Redwood. Little subject to disease or insect 

 attack. Squirrels remove the bark for nesting 

 purposes. A fungus (Fomes) attacks diseased 

 roots. 



Rowan, or Mountain Ash. A hardy upland 

 tree that is rarely injured by storms. Fungus 

 attacks are prevalent on old stems that have 

 become accidentally or otherwise damaged, and 

 the goat moth affects the stems and larger 

 branches of the rowan, as indeed almost all 

 species ,of Pyrus. 



