150 STUDIES OF TREES 



plete its round of life. The mature moths are marked with 

 dark spots resembling a leopard's skin, hence the name. 

 Fig. 106. It is one of the commonest and most destructive 

 insects in the East and is responsible for the recent death 

 of thousands of the famous elm trees in New Haven and 

 Boston. Fig. 107. 



Remedies: Trees likely to be infested with this insect 

 should be examined three or four times a year for wilted 



FIG. 106. The Leopard Moth. 



twigs, dead branches, and strings of expelled frass; all 

 of which may indicate the presence of this borer. Badly 

 infested branches should be cut off and burned. Trees so 

 badly infested that treatment becomes too complicated 

 should be cut down and destroyed. Where the insects 

 are few and can be readily reached, an injection of carbon 

 bisulphide into the burrow, the orifice of which is then 

 immediately closed with soap or putty, will often destroy 

 the insects within. 



