456 



New Phoma Disease of the Swede. 



Hyphce. — Colourless; septate. 



Symptoms of Attack. — Light or darker straw - coloured shallow depressions, 

 surrounded by a dark green border merging into purple, which enlarge and 

 extend over the surface of the root ; eventually deep transverse fissures 

 formed by the drying up of the cells. Pycnidia in the fissures and on the 

 dead cells of the root. Point of attack only on the parts of the root above 

 ground. 



M. C. Potter. 



College of Science , Newcaslle-upon-Ty tic . 



