ss F-493456, 495235, 501800 
FIGURE 150.—Spruce budworm, Choristoneura fumiferana: A, adult; 
B, eggs; C, larvae on twig of balsam fir. 
and drop down on silken threads. At this time, they may be 
blown considerable distances by the wind, often into uninfested 
stands. 
379 
