THE DISEASES OF PLANTS 



The Peach Curl. The peach curl does damage amounting 

 to about $3,000,000 yearly in the United States. It can 

 be almost entirely prevented by spraying with Bordeaux 



FIG. 102. BLACK KNOT 

 From Hodge's " Nature Study and Life," Ginn & Company 



Mixture before the buds open in the spring. A weak 

 mixture should be used, since the leaves may be injured 

 by too much copper. 



The Cotton Wilt. Cotton wilt completely destroys the 

 crop when it once establishes itself in the soil. The fungus 



