1 18 Diseases of Economic Plants 



of the gooseberry. It has quite prohibited the cultivation 

 of the finer sorts of Enghsh gooseberries in America and 

 is a grave menace to the culture of gooseberries in Europe. 

 Its destructiveness is due not alone to injury to the 

 fohage, bush, and to the fruit yield, but also to lack in 



Fig. 59. — Stages at which spraying should be given for mildew. 

 After Close. 



salability, owing to the unsightliness of the partially diseased 

 fruits. 



This powdery-mildew has been very successfully combated 

 by use of potassium sulfid, 1 ounce to 2 gallons of water, or 

 lime-sulfur, spraying five or six times. This treatment has 

 been known to reduce the percentage of mildewed fruits 

 from sixty-three on the untreated Ijushes to eighteen on the 

 treated bushes. The proper time to spray is indicated in the 



