190 AGRICULTURE ON THE PACIFIC SLOPE 



climbing up again, a rope or paper band covered with sticky 

 substance is tied tightly around the tree. (California Experi- 

 ment Station, Bulletin 183.) 



Cankerworm. This is also called the measuring worm or 

 inchworaij because it walks by looping its body along the 

 leaf or branch on which it is walking. When the tree is 

 jarred, the worm drops down and remains hanging by a 

 slender silken thread, by means of which it afterwards 

 climbs up again. 



In^the earl^summer the worms burrow in the earth, and 

 later come out as moths of two_kinds, one with wings and 

 another without wings. It is the moth without wings 

 which lays the eggs. The moth must crawl up the tree to 

 lay its eggs, and may be caught by a band of sticky paper' 

 tied tightly around the trunk. 



The potato worm. Everyone knows the burrows of the 

 potato ^worm as seen in wormy potatoes. The worm develops 

 into a moth which lays eggs on the potato plant or on the 

 potatoes; the worms come out of the eggs and attack the 

 stems or the potatoes. 



The infected potato stalks may be known by their wilted 

 appearance, and should be removed and destroyed. Dur- 

 ing the time of digging and storing, the potatoes should be 

 covered so as not to leave them exposed to the moth. The 

 stored potatoes may be freed from worms by using carbon 

 bisulphid, or by placing them under water. (California 

 Experiment Station, Bulletin 135.) 



The peach-tree borer. This is most common on peach and 

 #jmcot trees, or on prune trees growing on peach and plum 

 roots. It bores into the bark just beneath the surface of 

 the ground, and usually causes masses of gum to appear on 

 the outside of the bark. It develops into a moth which lays 

 eggs on the bark of the tree. 



