20 FARMERS’ BULLETIN 675. 
of lead trees on which they are feeding. It is doubtful if it would 
pay ordinarily to spray orchards for the purpose of killing this 
insect alone, but in exceptional eases, where orchards are badly 
infested and are not surrounded by prolific breeding places, there is 
little doubt that the treatment would be profitable. Fortunately 
the beetles are active at the season of the year when arsenical sprays 
for the codling moth and other orchard pests are usually applied. 
These sprays, used primarily to destroy other enemies of the orchard, 
without doubt kill incidentally many adult roundheaded apple-tree 
borers. 
WASHINGTON : GOVERNMENT PRINTING OFFICE ; 1915 
