Cyclamen Diseases 249 



serious in Germany. The general symptoms are the 

 same as for the violets. For a description of the 

 causal organism and general methods of control, see 



P- 355- 



Leaf Spot 



Caused by Glomerella rufomaculans, var. cycla- 

 minis Patt. and Ch. 



Symptoms. The spots are circular, watersoaked, 

 with sharply defined borders. 



The Organism. The acervuli of the causal organ- 

 ism are brownish, large, conidia straight to slightly 

 curved. Sets are few, short and rigid. It is very 

 probable that this conidial stage is the same as thiat 

 described by Halsted as Colletotrichum cyclamens 

 Hals. The ascus stage was found by Patterson and 

 Charles.* The perithecia are dense, found in defi- 

 nite light colored round spots, brown membrana- 

 ceous, subglobose with distinct opening. The asci 

 are eight spored, the spores are hyaline, one celled, 

 oblong to elliptic. The methods of control would 

 be the same as for Colletotrichum cyclamena. 



Anthracnose 



Caused by Colletotrichum cyclamena Hals. 



Symptoms. Anthracnose produces spots (fig. 52) 

 on the leaves which may be mistaken for the spots 

 caused by Fhoma cyclamena. Infection may occur 



•Patterson, F. W., and Charles, V. K., U. 8. Dept. of Agr. Bur. 

 PI. Ind. Bui. 171 : la-i j, 1910. 



