PLANTING AND CARE OF TREES 



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spicuous form. Attached to the posterior part of the female is 

 a Large cottony mass, containing the eggs. As the egg mass 

 increases in size, the posterior end of the body becomes more 

 elevated. When full grown, the brown female with the egg-mass 

 protruding is about a half inch in length. Another species attack- 

 ing the maple is known as the woolly maple scale and differs from 

 the above in that the woolly mass completely covers the female and 

 her eggs. 



Fig-. 92. The Tulip Scale. 



Fig,91. The Cottony Maple Scale. 



Most scale insects may be controlled by spraying with either 

 m.iscible oil or the lime-sulphur wash during the dormant season. 

 The former will give better results on old and rough-barked trees. 

 The important point is to completely cover the surface of the 



