SPRAYING 105 



wildly haphazard way that makes one wonder 

 if something has not been misplaced in their 

 brain boxes. Some of them seem to think that 

 the only essential is to get some dope on the 

 trees rgardless of the season and almost regard- 

 less of what the dope may be. They do not know 

 often what they are spraying with, and more 

 often what they are spraying for. Still an- 

 other class covers its ignorance by the most 

 lavish use of material in a way that brings joy 

 to the heart of the chemical manufacturers. 



As a matter of fact the business of spraying 

 is one of the most simple and easily understood 

 of all of our horticultural operations. To many 

 it is a new thing, and, being new, must of course 

 be mysterious, when it is in reality decidedly 

 simple. One must know first what he is spray- 

 ing for. Knowing this he must know what sort 

 of material to use against those particular ene- 

 mies. That is really all there is to it. 



Pests against which spraying is effective 

 may be classified in three groups: sucking in- 

 sects, chewing insects and fungous diseases. 

 For the first we must use spray materials which 

 will kill the insect by contact as it is obvious 

 that a sucking insect is not liable to go brows- 

 ing around over a tree eating material which 

 might contain poison. It obtains its food from 

 below the surface where we can not slip any 

 knock-out drops into its tea. If there was a 



