S6 



FUNGOID DISEASES 



from whence, In all probability, our land became in- 

 fected. Schilberszky noted and described it in 1896. 

 It was noticed in Great Britain In 1899, and is now 

 very prevalent in Lancashire and the Midlands. 



Symptoms, — On certain patches, or In extreme 

 cases on the whole of the potato, wart-like outgrowths 

 appear (see Fig. 24, A). As a rule, they are at the 

 " rose end " only, and are brownish in colour. 



B 



Fig. 24. — (A) Tubers with warty outgrowths {iv) caused by the wart 

 disease fungus {Synchitrium cndobioticum) ; (B) two sporangia (rest- 

 ing stage) with thick walls. 



Cause. — The cause of the abnormal growth Is to 

 be found In a low type of fungus, C cndobiotica, which 

 gains entrance to the tuber at the " eyes," and once 

 inside it stimulates the tissues resulting In the wart- 

 like growths. Numerous swarm spores are pro- 

 duced in these excrescences, which are capable of 



