lo8 FUNGOID DISEASES 



dressed with ofas lime. The swellinofs were at 

 the soil level, some of them being- bigger than the 

 double hand (see Fig. 31). No fungus mycelium 

 nor spores could be detected within the hyper- 

 trophied tissue, but it is conceivable that the fungus 

 found on the beet is also the cause of the mano-el 

 tumour. Observation leads him to believe that the 

 parasite enters at the small pits made in the root at 

 the soil level by slug bites, etc. ; there is, however, 

 no direct proof of this. 



Note. — Professor Bessey suggests that the tumours may have 

 been caused by the crown-gall bacteria {^Pscudomoiias tiiinefacicns) 

 which is known to cause large galls on mangels and other plants. 



