310 Diseases of Greenhouse Crops 



affected tissue dries, the spore masses are formed 

 on the upper part of the leaflets and appear as a 

 black exudate. 



Control, Infected material should be cut out and 

 destroyed by fire. Infected plants should not be 

 syringed, for hi this way the spores of the causal 

 organism are spread wholesale. Spraying with a 

 standard fungicide is also recommended. 



Leaf Spot 



Caused by Sph^rodithis neo washing tonia. 

 The disease is mentioned by Smith* as occurring 

 in California. The leaves become covered with 

 small elongated, black, slightly elevated spots 

 (fig. 61, g.). Affected leaves should be removed 

 and burned, and the plants sprayed with a standard 

 fungicide. 



Pansy {Viola tricolor). 



Cultural Considerations, Pansies are grown 

 mostly out of doors. Occasionally, however, flor- 

 ists raise them indoors as pot plants for purposes 

 of window decoration. Its cultural requirements 

 are about the same as for the violet (see p. 351). 



Diseases of the Pansy 



Pansies, like violets, are subject to about the same 

 diseases. 



* Smith, R. E., and Smith, E. H., California Agr. Expt. Sta., 

 Bui. 21S: 1148, 191Z. 



