200 THE TREE DOCTOR 



of the tree speedily follows. This has been pointed out in the 

 earlier part of this work. In about all the thinned-out wood- 

 lands through the country, trees are dying and the people do 

 not know the cause. There are places now in the city of Pitts- 

 burg, Pa., which but a few years ago were fine examples of the 

 primeval forest. Owners of such property thinned out the 

 trees so that grass might grow and look more lawn-like, so as 



Photo 185 

 Dying because of Luxuriant Growth of Grass. 



to sell more readily as residence building lots. Now the trees 

 are dying as seen in Photo 185. "Where trees begin to "go 

 back" in this way in the forest, harvest them at once ; for just 

 as soon as death sets in decay follows, and it becomes the breed- 

 ing place for every kind of borer, beetle and grub, and the timber 

 is soon unfit for marketable purposes. Such trees, however, 

 can be preserved as shade trees and, with proper care, will make 

 a new growth over the old and injured parts. Remember that 

 vour lawn and fruit trees should be keot clean. The old loose 



