Rose Friends and Foes. 109 



cultivator. Little by way of description is needed to enable 

 even the veriest amateur to identify the species in one stage 

 namely, by the powdery appearance it gives to the parts 

 affected. Many, however, seem to think that it is a leaf 

 trouble only : this is a mistake, as shoots, buds, and fruits 

 alike are involved. As the disease progresses, however, the 

 white powdery appearance is succeeded by a velvety mould 

 of a yellowish colour; and this in turn gives place to dark 

 (almost black) points in the mycelium. 



Some Roses are more prone to this disease than others ; 

 those least affected are the Hybrid Teas, Teas, and Noisettes ; 

 and it is present on plants in the open and under 

 glass. Preventive measures should be taken directly the 

 disease is noted. These should consist of flowers of sulphur 

 mixed with one-third its bulk of slaked lime; or, better 

 still, of sulphide of potassium (liver of sulphur), zoz. to 

 3gall. of water. This causes no unsightly look as in the case 

 of the powder sulphur and lime, though under glass it will 

 affect the paint. Severe attacks under glass are often 

 induced (not caused) by the conditions under which Roses are 

 often grown. Many amateurs seem afraid to allow a free 

 air circulation, and the plants are so weakened that they are. 

 in just the condition to take any disease to which they are 

 liable. Under glass the Sulphur Vaporiser as sold by Messrs. 

 Campbell would prove useful in restricting the disease. 



Further preventive measures consist in removing all 

 affected parts and burning them before the second stage in 

 the life-history of the fungus is reached, as then the spores 

 distributed by various agencies invariably increase the area 

 of infection unless the sulphur remedies are freely employed. 



Rose Brand. See Rose Rust, 

 Rose Rust (Phragmidium subcorticiuni). 



Whether we regard this and Rose Brand as two phases in 

 the life-history of one disease matters but little. It is usual 



