CHAPTER V. 



FUNGOID DISEASES OF CRUCIFERS. 



I. Finger- AN D-ToE iyPlasinodiophora brassicce). 

 Class: MvxoMVCETES (Slime Fungi). 



This disease is also known as anbury and club 

 root. It is widespread, and attacks many kinds of 

 cultivated and wild crucifers, but cabbages and 

 turnips in particular. 



Symptoms. — Abnormal tuberous swellings ^ (see 

 Fig. 26) appear of no fixed form, which gradually 

 become rotten and give off a very disagreeable 

 smell. While this is going on, the leaves lose their 

 waxy bloom and healthy green appearance, turning 

 yellow and stunted in growth. Finally the whole 

 root and leaves may become one mass of putre- 

 faction. 



Cause.- — Woronin first found the slime funofus 

 Plasmodiophora hrassicce which causes this disease. 

 Sections through the swollen parts, examined 

 microscopically, show that certain of the cells are 



1 Not to be confused with the swellings caused by the turnip 

 gall wee\'il {Ceutof'hy?ichus stilcicollis). 



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