96 PRESENT-DAY GARDENING 



black spores can be seen easily, and the character of the 

 malady is thereupon disclosed. This is such a deep-seated 

 disease that spraying is of little use. The only thing to be 

 done is to pick off and burn any diseased foliage before 

 the spores are distributed ; or in very bad attacks, to burn 

 all the plants and get a fresh stock. 



Violet Rust (Puccinia violce). This disease is due to 

 another parasitic fungus that grows in the tissues of the 

 plant. Its presence is denoted by pustules of powdery 

 uredospores which appear on the leaves. The disease is 

 somewhat like, but not identical with, that which attacks 

 the Hollyhock. On its first appearance all affected leaves 

 should be removed from the plants and burnt. 



Violet Black Mould (Cercospora violce). The presence 

 of this disease may be detected by pale spots appearing on 

 the leaves. These spots eventually develop tufts of short, 

 erect threads. It is not so serious as the diseases already 

 mentioned ; nevertheless the plants should be sprayed with 

 the Bordeaux mixture directly the disease is detected. 

 This preparation can be purchased from horticultural 

 sundries-men. 



Violet Mildew (Peronospora violce). This fungus is 

 like that which attacks the potato haulm and tubers. It 

 attacks Pansies as well as Sweet Violets, and causes a 

 whitish, felt-like covering on the under surface of the leaves. 

 Like all mildews, this disease spreads quickest in damp 



