334 



PROTECTION AGAINST INSECTS. 



c. Relations to the Forest. 



The oak leaf-roller moth infests oaks only, chiefly the 

 pedunculate oak because it shoots before the sessile oak, and 



Fig. 170. Oak trees stripped of foliage in Windsor Forest by 7\ rl rid nun ; 

 beech in full leaf. Photo by W. F. Perree. 



chiefly tall poles and mature trees. The attacks of the 

 caterpillar involve the buds, leaves and inflorescence, and 

 spread from the summit of the crown downwards. The 



