Schizanthus Diseases 333 



deeper and deeper until the affected parts topple 

 over and break. The lesions are light brown and 

 dotted with the acervuli of the fungus. On the older 

 parts of the plant the lesions take on the forms of 

 cankers, although they do not sink as deeply. Oc- 

 casionally, the disease attacks the leaves, forming 

 light brown spots which are irregularly scattered. 



The Organism. In structure Colletotrichum 

 schizanthi is not different from any other Colleto- 

 trichimi. The black setse are very numerous. The 

 conidia are one celled, hyaline, oblong, and granu- 

 lar (fig. 68, c and d.). 



Control. Diseased plants or parts of plants 

 should be destroyed by fire. Spraying with a stand- 

 ard fungicide is also reconunended. 



