CONTENTS 



Page 



Kinds of forest insects and the 

 losses they cause 5 



Relation of insects to forest man- 

 agement 12 



Determining causes of forest-tree 

 damage 13 



Insects affecting seed production 17 



Key to diagnosis of insect in- 

 jury to cones and seeds .... 17 



Insects injurious to forest nur- 

 series 27 



Key to diagnosis of insect in- 

 jury to forest nursery trees . . 28 



Insects injurious to young trees 

 (seedlings, saplings, and poles) 32 



Key to diagnosis of insect in- 

 jury to young trees 32 



Insects affecting roots 34 



Insects affecting twigs, ter- 

 minal shoots, and buds .... 35 



Sap-sucking insects 55 



Key to diagnosis of sap- 

 sucking insect injury .... 55 



Gall makers 68 



Key to recognition of some 

 important insect galls .... 69 



Feeders on the inner bark of 

 young trees 73 



Defoliators of young trees .... 74 



Page 



Insects injurious to mature forest 

 trees 74 



Key to recognition of insect in- 

 jury to mature trees 75 



Defoliators 75 



Key to diagnosis of injury 

 from defoliating insects . . 78 



Miners in the inner bark and 

 phloem 126 



Key to diagnosis of insect in- 

 jury to the inner bark .... 126 



Insects injurious to wood and 

 other forest products 179 



Key to diagnosis of insect in- 

 jury to wood and wood 

 products 181 



Insects working in unseasoned 

 logs or lumber 182 



Insects working in seasoned or 

 decaying wood 203 



Insects injurious to forest range 

 plants 208 



Natural control 211 



Control of injurious forest insects 217 



Silvicultural control 218 



Biological control 220 



Artificial or remedial control.. 221 



Literature cited 246 



Index of host trees 255 



General index 273 



