60 ROSES 



are produced as minute black dots on the 

 under surface of the leaves. 



The appearance of the disease in spring 

 depends entirely on the presence of winter 

 spores in the neighbourhood. It is therefore 

 necessary to collect and burn all fallen leaves 

 in the autumn. Plants that have been at- 

 tacked the previous season should be thor- 

 oughly drenched with a solution of sulphate 

 of copper in water two ounces in three 

 gallons in early spring before the buds 

 expand. The soil around the plants may 

 also be sprayed with the same solution. 

 Diluted Bordeaux mixture, or ammoniated 

 carbonate of copper solution, checks the 

 aecidium and uredo stages. 



The fungus also grows on wild roses, and 

 these may become a source of infection unless 

 precautions are taken. 



When a shrub is badly infested there is 

 little better to do than cut the whole plant 

 away close to the ground. This fungus is 

 closely related to {he one upon the blackberry 

 and raspberry, causing the destructive rust 

 of those plants. It has been shown that the 

 fungous hyphae penetrate all parts of the 

 blackberry plant, even the roots, and the rose 



