MAINE AGRICULTURAL EXPERIMENT STATION. 191O. 34I 



be scraped smooth to prevent the insects from crawling up be- 

 hind the paper. If the fall canker-worm is present, of course 

 the treatment must begin in October. If the trees are already 

 attacked, jarring the limbs will cause many of the worms to 

 spin a thread and drop to the ground. If the band of tangle- 

 foot is' in place they will be unable to return to the attack and 

 may be destroyed. 



The surest w^ay of fighting this pest, how^ever, is by spraying 

 with Paris green or arsenate of lead (Formula 6). 



2. Cecropia Moth. 



(Samia cecropia.) 



The large gray or brown cocoon of the Cecropia moth is fre- 

 quently found attached to the twigs of trees (fig. 37). 



Fig. 7. (From 'Me. Agr. Exp. Sta. Circular.) 



These are spun late in August or September by a green cater- 

 pillar about four inches long. The body of the caterpillar is 

 ornate with colored bead-like tubercles, the two pairs nearest 

 the head being red with black spines, and the other dorsal tuber- 

 cles smaller and yellow. Along the sides of the body the tuber- 

 cles are bluisli. (Fig. 7)- 



After the cocoon is spun the caterpillar changes to the pupa, 

 a dark brown object which may be found by opening one of 

 the cocoons during the winter. 



