244 Diseases of Greenhouse Crops 



Clematis 



Cultural Considerations same as Cyclamen, p. 

 248. 



Diseases of the Clematis 



Clematis is a hardy plant. In the greenhouse it 

 is subject to but few diseases. 



Anthracnose 



Caused by Gloeosporiutn cletnatidis Sor. 



This disease was first met with by Sorauer * on 

 Clematis Jackmanni in Gennany. It is not known 

 whether this disease is present in the United States. 

 Its introduction into this country should be carefully 

 guarded against. Little is known of the causal or- 

 ganism. The disease may be kept in check by the 

 destruction of diseased material. 



Leaf Spot 



Caused by Cylindrosporium cletnatidis E. and E. 



This trouble is manifested as reddish brown sub- 

 angular to roundish spots on the leaves. The acer- 

 vuli arc immersed, scattered and few in numbers. 

 The conidia are somewhat curved and when ripe 

 exude in a white mass. C. clematidis, var. Jack- 

 manni E. and E., also found on the clematis, dif- 

 fers from the former in the acervuli exuding a 



*Sorauer P., Ztschr, Pflanzenkrank. 7: 230, 1897. 



