12 FARMERS’ BULLETIN’ 675. 
METHODS OF CONTROL. 
This insect in its borer stage lives and feeds under the bark where 
no poisonous or contact sprays or washes can be directed against 
either its food or its body, and consequently it has always been con- 
sidered a difficult pest to control. Modern insecticides have not been 
used so successfully against it as against many other common insect 
I'ic. 18.—Pupxe of roundheaded apple-tree borer. (Original.) 
enemies of the orchard. However, there are practicable methods 
whereby the borers may be destroyed, or oviposition prevented, and 
injury thus greatly reduced or entirely eliminated, even in orchards 
that have suffered severely. In the use of these methods timeliness 
and thoroughness are essential factors, just as they are essential in 
the processes of combating most insect pests. 
