100 



Department as do fruit-growers and gardeners,, and as such calls 

 would be in this particular instance one of the main sources of my 

 information, it may be that the disease is more common than I 

 think. 



The specimens showing the above symptoms had numerous red mites 

 on them, and the symptoms may have been complicated by this fact, 

 but that seems doubtful. Probably the diseased appearances were 

 due to the fungus alone. The mites may have been feeding on the 

 spores of the Septoria. 



Rust of the Carnation. 



I believe the carnation, even in a state of nature, suffers considerably 

 from this disease, but under cultivation it suffers much more severely, 

 especially in some of the more rank and tender of the florist's creations. 

 The disease is not very common in this country, but I have occasionally 

 seen severe cases. The attack is marked by the appearance on the 

 foliage and stalks of streaks of a dark brown .colour and a powdery 



nature breaking through the epidermis. 

 The brown or reddish powder becomes 

 loose, and through its agency the disease 

 is spread from one plant to another. 

 The rust fungus causing the disease, of 

 which the abovementioned powder con- 

 stitutes the spores, is enormously pro- 

 ductive, and under favourable conditions 

 the disease spreads rapidly, and does much 

 damage. Plants in greenhouses are quite 

 as subiect to attack as those in the open. 



Fig. 115. The rust of the carnation, Uro- J f 



myces caryophylorum. Two ellip- 1 here IS more than OU6 TUSt that 



soidal teleuto spores and one nearly ,, -\ .r j. r 4. J.T, j. 



spherical uredo spore. The uredo attaCKS the Carnation, DUt that Seen 



JSS^Xtffi&.SS'ESi by * $* country is Uromyce* 



each a single terminal germ-pore. CO/ryophylorum, the Spores of which are 



shown in the accompanying illustration. 



The disease may be treated with some success with Bordeaux 

 Mixture if the spraying be well done. Such mixtures do not cling 

 well to carnation plants, and, unless care is used in the application, 

 little good will be done. If the plants are sponged with Condy's 

 Fluid, that treatment will mitigate the disease. 



Diseased material should be destroyed. The disease also attacks a 

 variety of other plants of the pink family. This fact should lead to 

 a consideration of whether there are any other plants in the vicinity 

 that may harbour the disease. If any such exist they should receive 

 attention. 



If it is desired to save plants already attacked, it is well to move 

 them to new surroundings, taking special precautions that no diseased 

 portions or untreated plants are removed. Patiently and carefully 

 removing and destroying all diseased material should be the main 

 reliance in most cases, though the application of fungicides will be a 

 paying operation in the larger plantations of the florist. 



