58 



PRACTICAL TREE REPAIR 



From Department of Agriculture Yearbook, 1910 

 Work of the flat-headed sycamore beartwood borer 



ber. If the grubs are to be dug out, the work 

 should be done in the fall, before they enter the 

 wood. The Bureau of Entomology has found 

 that the hibernating grubs can be killed by spray- 



