The Substances for Spraying 



331 



think that dust-spraying does not have sufficient pene- 

 trating power for orchard work. 



7. The farmer should know what he wants to kill before 

 he begins to spray. It is still common to find a man who 

 is going at spraying with enthusiasm, but who cannot 

 explain a single definite object in view. He merely knows, 

 on general principles, that spraying is useful. To such a 

 man, spraying is spraying, 



whether he uses arsenicals, 

 or bordeaux, or both, or 

 neither one; and his results 

 are about equal to his 

 knowledge. There is no 

 longer an excuse for such 

 practice, for all the leading 

 insects and fungi have re- 

 ceived treatment in the 

 publications of the govern- 

 ment and experiment sta- ^^ 128 - Dust-sprayer. 

 tions. Of course, the real fruit-growers are well and exactly 

 informed, even to details; but there are some persons who 

 need to know that: 



The arsenicals are used to kill all larvae or worms, 

 and all those insects that chew the leaves or shoots, 

 such as the codlin-moth, bud-moth, canker-worm, 

 potato-beetle, tent-caterpillar, and the like. Lime- 

 sulfur and kerosene emulsion are used for scale-insects 

 and plant-lice. 



Lime-sulfur and bordeaux mixture are used to 

 prevent the attacks of fungous parasites, as apple-scab, 

 leaf-blight of the pear, quince and plum, potato-blight 

 and such like. 



The leading poisonous insecticide is now arsenate 



