DISEASES IN GREENHOUSE 109 



the ventilation and the watering are prop- 

 erly attended to. 



FUSARIUM ROOT ROT 



Fusarium lathyri Taub. 



There is no record in the mycological 

 literature of a Fusarium disease of the 

 sweet pea. Numerous complaints from 

 florists showed that sweet peas often did 

 not grow well under glass because of a 

 root rot which developed early and in some 

 cases destroyed the entire planting. Cul- 

 tures made by the writer from infected ma- 

 terial or from the infected soil gave in each 

 case a pure culture of Fusarium. 



Symptoms. The disease produces a 

 sudden flagging of the leaves accompanied 

 by sudden wilting and collapse of the seed- 

 ling. Usually a fair percentage of the 

 seeds germinate and the plants reach the 



