28 CIRCULAR NO. 118, BUREAU OF PLANT INDUSTRY. 



tion of lead arsenate in the proportion of 2 pounds of the arsenate 

 paste to 50 gallons of water. Those who decide to spray for this 

 insect should first secure reliable directions for carrying on the work. 



Borers have been found in some young trees, but they have not been 

 doing much general damage. The borers usually enter at some in- 

 jured point on the bark of the tree. It is therefore advisable to take 

 every precaution to keep the bark in a healthy uninjured condition. 

 Whitewashing to prevent sun scald helps to keep out the borers by 

 keeping the bark healthy. When borers get under the bark of trees 

 they should be dug out and destroyed. If the borers succeed in 

 girdling the trunk they will cause the death of the tree. For this 

 reason it is wise to watch the young trees carefully, so that the borers 

 will not have an opportunity to do serious damage before they are 

 removed. Their presence is usually indicated by the accumulation of 

 castings at the mouth of the burrow. 



Woolly aphides have been found in some orchards, but do not seem 

 to be doing serious damage. 



[Cir. 118.] 



