INSECT ENEMIES OF WESTERN FORESTS 



55 



bright-red maggots. If the pockets are not numerous enough to kill 

 the terminal the injury heals over, but for several years the annual 

 rings are distorted into a peculiar whorl until the pocket is completely 



Figure 25. — Work of the bud.scyi' pine luidgi' (l^<-tuiO(Uijlosis sp.) : A, Twig tips killed by 

 midge attack; B, pitch gall in cambium ; C, birdseye effect in pine lumber. 



covered. This produces a defect in the grain of ponderosa pine 

 lumber known as "birdseye pine" which actually enhances its value 

 for finishing purposes. 



