2U 



COMMON DISEASES OF CROPS 



fall to the ground and infect the tubers, producing a 

 dry rot, which may be followed by the wet rot, induced 

 by the action of molds or bacteria. 



The main prevention of all fungous diseases is by spraying 

 the crop with Bordeaux Mixture. This is made in various 

 strengths, but generally from the 5-5-50 formula. Five 



POTATO BLIGHT. 



The vines on the left were sprayed with Bordeaux Mixture ; those to 

 the right were unsprayed. 



pounds of lime are slacked in a barrel containing 25 gal- 

 lons water, and five pounds of bluestone are dissolved in 

 another barrel containing 25 gallons water. When the 

 bluestone is in solution, it is mixed with the lime, and 

 stirred vigorously, as the mixture takes place. 



In case of danger of potato blight, the plants should be 

 sprayed when, no higher than six inches. Two weeks 

 later a second application should be used ; and two weeks 

 later still, a third application. Clean " seed," crop rota- 



