112 DISEASES OF THE SWEET PEA 



mydospores is smooth, but in old cultures 

 it becomes slightly warty or covered with 

 minute points. No perfect stage has been 

 found to accompany this fungus, either on 

 the host or in pure culture. 



Fusarium root rot is a serious disease 

 which threatens to undermine the growing 

 of greenhouse sweet peas. The grower 

 should do everything possible to prevent 

 its introduction into the house. In places 

 where this disease has already gained a 

 foothold, soil sterilization becomes a nec- 

 essary part of sweet pea culture under 

 glass. 



THIELAVIA ROOT ROT 



Thielavia basicola Zopf. 



In 1912, Chittenden ^ was asked by the 

 National Sweet Pea Society of England to 

 investigate the "streak" disease of the 



^Chittenden, F. J., Diseases of the Sweet Pea, Sweet 

 Pea Annual: 14-24, 1912. London. 



