234 



INSECTS 



The leaf-feeding insects and other external feeders 

 can be successfully killed by spraying poisons upon 

 the foliage. By eating the foliage with the poison on 

 the surface these insects are destroyed. The food of 

 the juice-sucking insects cannot be poisoned, and these 

 pests, such as plant lice and scale insects, are killed 

 by poisons sprayed upon their bodies. The soap and 



V 



MOSQUITO WIGGLERS 



petroleum emulsions are effective sprays to kill by con- 

 tact. The young worms of the codling moth can be 

 destroyed by sprays before they enter the apples. 



Mosquitoes. Another effective method of dealing 

 with insect pests is the destruction of breeding places. 

 Mosquitoes can be prevented by draining marshes 

 and other wet places in which the eggs are laid. The 

 young mosquitoes, which are the wigglers that we often 

 see in standing water, may be easily killed by pouring 

 kerosene over the water. 



Destruction of breeding places. By preventing 

 the access of flies to garbage and stable manure, the 



