REPORT OF THE STATE ENTOMOLOGIST IQI2 69 
wholly or in part the past summer, because it is these trees which 
contain living grubs. General cooperation over an extended area, 
in the cutting out of infested trees and burning of the bark as 
outlined above, will do much to check this deadly enemy of hick- 
ories. It is a method which has been tried in some sections with 
marked success and is more practical on large holdings than 
where the cooperation of numerous owners must be secured. This 
destruction of the insects does not prevent the utilization of the 
wood and timber commercially, provided the bark is destroyed 
within the above given time limits. Slabs from sawlogs and fire- 
wood with the bark on should all be burned during the winter. 
If it is impractical to work up the logs and burn the slabwood, 
the borers can be destroyed by a prolonged submergence in water 
or by removing only the bark and burning that. 
The possibility of protecting trees which have been entered the 
past season, is discussed under experimental work. Such treatment 
can never be advised for ordinary woodland conditions. 
