204 Diseases of Greenhouse Crops 



Texas. It was proved definitely that the organism is 

 parasitic and that it was also apparently an unde- 

 scribed species to which the name Fhoma poolensis 

 Taubenhaus was given. The pycnidia are minute, 

 numerous, black, with distinct mouths (ostioles). 

 The spores ooze out in a colorless gelatinous rope- 

 like mass. They are small, elliptical, hyaline, and 

 one celled. 



ControL The methods of control for this disease 

 should be the same as those used for anthracnose. 



Blight 



Caused by Septoria antirrhini Desm. 



This disease is greatly dreaded by English gar- 

 deners. It was first described by Chittenden* who 

 claims that it is very prevalent in Great Britain. 

 Fortunately, it is not yet known to occur in the 

 United States. The disease is characterized by a 

 general blighting and dying of the leaves and 

 branches. 



Wilt 



Caused by Verticillium sp. 



This disease, although new, is prevalent all over 

 the United States. Little is known of the disease 

 and of the causal organism. The Verticillium, how- 

 ever, may be introduced with infected soil or ma- 

 nure, or with diseased cuttings. To prevent the 



♦Chittenden, J. F., Jour. Roy. Hort. Soc. 35: 216-217, 1909. 



