678 



PROTECTION AGAINST DISEASES. 



b. When due to Injuries. 



Great care should be taken during timber-fellings and 

 transport. 



Pruning of green branches should, if possible, be avoided, or 

 restricted to branches under 4 inches in diameter ; all wounds 

 made by pruning should be smeared with tar. 



All rotten trees and stumps should be speedily removed 

 from the forest. 



All measures dictated by forest protection should be strictly 

 followed in order to prevent injuries to the trees. 



Fig. 295. Frost-crack in an oak tree. Dillenburg. 

 Photo, by R. E. Marsden. 



