INSECT INJURIES TO HARDWOOD FOREST TREES. 



.\IKTIH>|iv OF IONTKOI.. 



319 



If the trees die lute in the Miimner the broods of the beetles will 

 remain in the bark over winter, and can easily be destroyed by felling 

 the tree>. removing the bark from the trunks, and burning the 

 branches. The removal of the bark in the winter is sullicient to kill 

 the broods, but it is easier to burn the branches than to remove the 

 bark from them. This work can be done at any time between 

 September and the following March. If the trees die earlier in the 



FIG. 31. Brood galleries of the cherry bark-beetle, showing character 

 of primary galleries and larval mines. (Original.) 



season it will be best to fell them and treat as above as soon u< the 

 leaves commence to die, in order to prevent the development and 

 emerging of a possible second generation before winter. 



It is also important, especially in farmers 1 woodlots, to have all tops 

 and branches from oak trees felled during the winter, piled and 

 burned between the 1st of May and the 1st of June. This will allow 

 the spring brood to commence operations in the bark of such material 



