58 



upon the needles, and if numerous enough, entirely strip the trees of their 

 foliage. Those who oAvn valuable ornamental larches should watch for 

 this enemy, and spray the foliage thoroughly w^ith Paris green or lead ar- 

 senate as soon as the larvae appear, and before the foliage is much in- 

 jured. 



Other leaf-feeding species, such as the Spruce Saw^-fly, which quite 

 frequently strips the foliage from, ornamental spruces; the Hickory Tiger- 

 moth, common on many deciduous shade trees, and many others, are 

 controlled by poison sprays. 



The Spruce Gall Aphides ( Chermes similis and C. abietis ) . These 

 t"wo species of plant lict feed in the axils of the young needles, sucking 

 the juices. The irritation causes an abnormal growth of the bases of the 

 needles so that eventually a more or less cone-like gall is produced. 

 The affected t^vigs are frequently killed, and many fine ornam.ental 

 spruces in different parts of Quebec Province have been badly disfigured 

 or destroyed in recent years by these t-wo species. 



Thorough spraying of the infested trees with whale. oil soap, one pound 

 to tw^o or three gallons, in early spring while the trees are dormant, is 

 recommended. 



