HEAD FORMATION IN APPLE TREES 



173 



Plate XII. Northern Spy Tree D56, at six and seven years. 



These figures show how heading back the branches while allowing the unhindered 

 development of the leader has favored the development of a leader tree. This heading 

 back has necessitated much thinning out of one-year twigs the next year. The tree is 

 not as large as it would have been if it had not been headed back. This type of 

 pruning is worse than none at all. 



