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 w "horl until the pocket is completely 
FIGURE 25.—Work of the birdseye pine midge (Retinodiplosis sp.) : A, Twig tips killed by 
midge attack; B, pitch gall in cambium; CO, 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, 
