

CONTENTS. 



Page. 



Extent of damage determined by special investigations 313 



The character of inject injuries to living forest trees 313 



Injuries which cause the death of trees 314 



Injuries by bark-beetles 314 



Injuries by bark-boring grubs 314 



Bark-beetle injuries to hickory trees 314 



The hickory bark-beetle f 314 



Kxternal character of the injury 315 



Method of combating the insect 317 



Bark-beetle injuries to oak trees 318 



Methods of control 319 



1 5ark-l >eetle injuries to other trees 320 



Oaks, chestnut, birches, and poplars killed by bark-boring grubs 320 



Methods of control 321 



Insect injuries to the wood of living trees 323 



Pinhole injuries in oak wood 323 



Pinhole and wormhole injuries to chestnut wood 324 



Characteristics of the chestnut timber-worm 325 



Methods of preventing losses 325 



Carpenter- worm injuries to oak and locust 326 



Methods of control 327 



Work of the Columbian timber beetle 327 



Character of the work 327 



in 



