CONTENTS. 



Page 



Introduction 9 



General Review of Forest Insect Conditions 10 



Detailed Account of the Chief Injuries 12 



Injury to Bull Pine. 12 



Bark-beetle Injury about Princeton, B.C 12 



The Western Pine Bark-beetle 13 



The Western White Pine Bark-beetle 20 



The Red Turpentine Bark-beetle 20 



Spread of Infestation 21 



Recommendations for Control 22 



Minor Injuries to Bull Pine 23 



Injury to Western White Pine 26 



The Western White Pine Bark-beetle 26 



Injuries to Lodgepole Pine 28 



Injuries to Douglas Fir 28 



The Douglas Fir Bark-beetle 28 



Injuries to the Sitka Spruce 33 



The Sitka Spruce Bark-beetle 33 



Ambrosia-beetles 36 



The Larger Wood Borers 39 



