152 MASS. EXPERIMENT STATION BULLETIN 178. 



reduce the chances that any of the insects will survive. Ensilage by- 

 ordinary methods must prove a highly effective method of destroying the 

 insects present in the stems or other parts of the affected plants, for it 

 would seem to be ia the last degree improbable that they could survive 

 under the conditions existing in the silo. 



Co-operation. 



It has been pointed out that the caterpillars which survive the winter 

 emerge as moths which fly freely the following spring. Consideration of 

 this fact makes it apparent that no method of control can be even fairly 

 satisfactory unless all those cultivating corn in an infested district co- 

 operate to insure as far as may be possible the destruction of all hiber- 

 nating insects. A few neglected gardens in any vicinity may harbor 

 enough borers to infest a wide area. 



Measures for insuring or compelling satisfactory handling of all infested 

 material are, therefore, very necessary, and, while the desired end might 

 possibly be obtained by local organizations of farmers and gardeners and 

 vigorous action, it seems probable that the matter must be taken in hand 

 by the State or Federal government if the insect is to be brought under 

 control. 



