524: XEW JEESEY AGRICULTUEAL COLLEGE 



older ones, and nursery stock is sometimes severly injured by the 

 pest. 



Many experiments have been made with various solutions, and none 

 are more effective than the standard Bordeaux mixture. 



This mildew has wider range of hosts than the one upon the peach, 

 and may l)e found upon various species of spireas and hawthorns, 

 while the quince is occasionally affected. All of these plants are 

 •closely related to the apple, cherry and phim. 



Po-nrdery Milde-nrs of the Fruit Garden • 



The leading mildew of the small fruits is Splicerotheca Mors-lvce 

 (Schw.) that preys upon the gooseberry. It differs somewhat in 

 habit of growth from the others because it forms a thick, brownisli 

 covering upon the canes, leafstalks and the fruit. While it is found 

 upon several of our native species as growing in the wild state, it is 

 unusually destructive to European cultivated varieties, and has been a 

 serious check to the extensive cultivation of these latter sorts in 

 America. Professor Salmon, in a recent letter, stated that this mil- 

 clew is upon the increase in Ireland and becoming a serious pest. 

 Yery good results have, however, attained the use of fungicides, and 

 among them that of sulphide of potassium has proved satisfactory. 

 This is a simple solution, easy and cheaply made and may be em- 

 ployed without the risk that obtains with some others. 



The powdery mildew of the grape {Uncinula necator Schw.) is 

 found upon several of the wild species and also infests the American 

 ivy, a near relative of the grape, ^^^lile this mildew may appear 

 upon the fruit and canes, it is usually confined to the leaves, and 

 there is not conspicuous, particularly upon tlie woolly sorts. In 

 America this fungus is not very serious, but in Europe it has been 

 among the worst enemies of the grape, and the amount of its destruc- 

 tion in a single season is truly vast. With the present knowledge of 

 methods of treatment with fungicides there is no longer occasion for 

 alarm. 



The strawberry is occasionally infested with a mildew Spceentliica 

 Hiimuli (DC.) var. fuliginea (Sachkt.). but as yet it has not become 

 serious. 



