TENT CATERPILLAR 



197 



The remedies for these apple borers are mechanical. The 

 larva? must be found and killed before they have done much 

 damage. Cut away the outer bark with the point of a knife or 

 wire and destroy the larva. The trunk of the tree may be pro- 

 tected from the adults by bands of paper or other materials which 

 will keep the adult beetles from laying their eggs on the trunk. 

 Netting shown in figure 123 may be fine enough to keep out these 

 beetles. Repellent 

 washes are sometimes 

 used. One of the best 

 of these is a heavy coat 

 of lime-sulfur. 



Canker Worm. — This 

 is sometimes called a 

 measuring worm, as the 

 feet of the larvae are at 

 the two ends of the 

 body, and the insect 

 seems to be measuring 

 the distance as it 

 travels. These occur in 

 large numbers in the 

 trees and destroy the 

 leaves. As the leaves of 

 a tree are its lungs and 

 digestive organs it suf- 

 fers greatly from the 

 attacks of this insect. 

 All biting insects can 

 be readily destroyed by 

 applications of poison. 

 Arsenate of lead with 

 summer strength lime- 

 sulfur is used when 

 attacks are noticed. 



Tent Caterpillar. — There are two forms of tent caterpillar which 

 commonly attack trees. The larva of the apple tent caterpillar 

 has a row of yellow dots down the middle of the back instead of a 

 yellow stripe found on the forest tent caterpillar. Both of these 

 attack a number of kinds of trees, and as their work and remedies 

 are somewhat similar they may be considered together. The egg 



Fig. 122. — Adult beetle of the round headed apple tree 

 borer. The holes show the woun ds made by the insects. 

 The larvae are very destructive to apple trees. Watch 

 the base of the trees and when borings are found follow 

 the channels with a wire and crush the insects. (West 

 Virginia Station.) 



