

Fig. 30. Cabbage Diseases. 



a. Club root (after Cunningham), b. cell filled with spores of the club root or- 

 ganism, c. spores and swarm spores of Plasmodiophora brassica (b. and c. after 

 Chuff), d. black rot of cabbage (after F. C. Stewart), e. individual black rot germs of 

 Pseudomonas campcstris, f. black-leg on young cabbage seedling, g. black-leg lesion 

 on foot of older cabbage plant, h. black-leg lesion on cabbage leaf, i. pycnidium of 

 Phoma uleracece.j. pycnospores of P. olcracece (i. and.;, after Manns). 



