Figure III — Mechanical injuries furnish places of entry for canker produc- 
ing and wood rotting fungi. (1) Small branch grown into a crotch. Note 
margin of canker at bottom. (2) Crossed branches. Note very small fruiting 
bodies of canker producing fungus. Note (3 and 4) the abnormal growth from 
choking effect of wire girdle. (Courtesy of Mr. W. G. Brierley.) 
Figure IV — Careless pruning. This 
branch was killed by Are blight. 
These wounds would never heal 
properly, but would always present 
a place for entrance of wood rot- 
ting fungi. See Figure I. 
