54 ROSES 



the leaf blight of the strawberry. It is impor- 

 tant to know these relationships between 

 the various plant diseases, for it is helpful in 

 the struggle in overcoming them. The leaf 

 blight of the strawberry is very much more 

 common than that of the rose, and any 

 effective remedy found for the former may be 

 of value in checking the ravages of the latter. 

 Fruit growers have found this strawberry 

 leaf blight a hard one to check, perhaps 

 because of its many forms of spores and the 

 low habit of the plant and the consequent 

 difficulty of readily spraying the foliage upon 

 the under side. This difficulty does not obtain 

 with the rose, and it may be controlled more 

 easily. There is no question but that the 

 standard fungicides should be used when 

 this fungus is at work. 



The Rose Mildew. The most familiar 

 fungous enemy of the rose is the mildew 

 (Sphaerotheca pannosa, Wallr.). This dis- 

 ease has been known for a long time and is 

 quickly recognised by the powdery coat it 

 develops upon the affected parts. It is so 

 rapid in its development that rose growers are 

 sometimes inclined to assign the cause of the 

 growth to that which is in reality only the 



