24 MAINE AGRICULTURAL EXPERIMENT STATION. 



of the preceding, and the rear wings are slightly shaded. The 

 larvae of this species also, besides having three pairs of legs 

 under the hind end of the body, as shown in figure 6, have a 

 broad, dark stripe along the back, as opposed to the narrow 

 markings of the other species. The eggs, which are slightly 

 larger than in the previous species, somewhat resemble small 

 flower pots and are attached to the bark, in exposed situations, 

 in masses of from 60 to 200, placed side by side as seen in figure 

 6, e. The eggs highly magnified, are shown in figure 6 a. 



Fig. 6. a, single egg, much en- 

 larged ; e, egg mass ; f , larva, 

 showing the three pairs of 

 posterior legs. (After Riley). 



The eggs are deposited in fall or early winter (sometimes in 

 mild winters as late as March). They hatch about the same 

 time as those of the other species and the larvse act in a similar 

 manner, entering the ground about the same time. Instead of 

 forming a cell lined with silk, however, this species spins a tough 

 cocoon, and the moths come forth and begin laying eggs in 

 October and November. 



HOW TO FIGHT CANKER-WORMS. 



One of the surest preventive measures is to place a band of 

 tarred or other heavy paper about the tree in March and smear it 

 with tree tanglefoot, thus preventing the ascent of the female 

 moths and the deposit of eggs. A band 6 or 8 inches wide is 

 sufficient and all roughnesses beneath it should be filled with 

 cotton. If the fall canker-worm is present, of course the treat- 

 ment 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 tanglefoot is in place 

 they will be unable to return to the attack and may be destroyed. 



Perhaps the best way of fighting this pest, however, is by 

 spraying with arsenate of lead, giving one application just 

 before the blossoms open and a second after the petals fall. 



