FRUIT GROWING 



307 



should, however, be removed during the growing season. 

 As the tree becomes older, the low, vase-shaped top will 

 protect the trunk. 



Insects. — Injurious insects are divided into two classes ; 

 viz., those that chew, or eat the tissues of the plant, and 

 those that suck the juices from it. 



In the first class, we find such insects as the apple worm, 

 or codhng moth, the canker worm, the strawberry leaf 

 eater and the po- 

 tato bug. These 

 insects devour the 

 leaves or fr.uit, 

 leaving nothing 

 but the mere skele- 

 ton of the leaf or 

 perhaps a fruit 

 filled with long 

 tunnels to show 

 where they have 

 eaten their way 

 through. 



Inasmuch as 

 these insects de- 

 vour the parts of 

 the plant, they may be destroyed by applying a mist, or 

 spray, containing some deadly poison, such as Paris green or 

 lead arsenate. The latter is usually the more satisfactory 

 because it staj's on the leaves better and never burns them 

 as the Paris green sometimes does. If two povinds of lead 

 arsenate are dissolved in fifty gallons of water, the solution 

 will destroy almost any chewing insects. It is used as a 

 spray as they appear. 



In combating strawberry worms or cabbage worms, it 

 is often unsafe to use either of the poisons named above. 



Fig. 140. — Codling moth and its work. 



