Pests and Diseases 77 



For spraying Irish potatoes, cucumbers, and other 

 crops that are grown on extensive areas, the horse spraying 

 machine becomes an economic implement. In spraying 

 Irish potatoes for late blight and early blight, it is rather 

 important to go over the field twice in opposite directions. 

 In this way the foliage is covered better than when the 

 spraying is done only in one direction. 



The most perfect of the sprayers now in use is the power 

 sprayer. These develop a pressure of 80 to 100 pounds 

 and make it possible to reduce the spraying mixture to a 

 mist, thus reaching not only the upper surface of the 

 leaves, but the under surface as well to a large extent. 



