316 



BULLETIN No. 189 



[June, 



CABBAGE, Brassica oleracea 



Atkinson, 4 in 1895, in his article on damping-off diseases, men- 

 tioned cabbage seedlings as being susceptible to damping-off by Rhi- 

 zoctonia. 



Duggar and Stewart 32 in 1898 received from Illinois specimens 

 of cabbage seedlings which had been diseased by Rhizoctonia. They 

 found that the disease sometimes affected very young seedlings, caus- 

 ing damping-off, but that it was mpre common after the plants had 

 developed one or two true leaves. In the latter instances, small lesions 

 at or below the surface of the soil characterized the disease. Later, 

 Duggar and Stewart found 

 Rhizoctonia causing a sim- 

 ilar disease of cauliflower 

 seedlings in New York. 

 The plants showed ulcera- 

 tion at the bases of the 

 stems, the entire cortex in 

 some cases having disap- 

 peared. 



Fawcett 40 reported a 

 stem rot of cabbage seed- 

 lings due to Corticium va- 

 gum B. & C., in Florida, in 

 1909. According to his 

 description, the disease 

 was a typical stem rot, 

 with a softening of the epi- 

 dermis followed by a shriv- 



FIG. 10. STEMS OF YOUNG 

 CABBAGE PLANTS INOCU- 

 LATED WITH Rhizoctonia 

 Solani FROM CARNATION 



FIG. 11. STEM OF AN OLD CABBAGE 

 PLANT WHICH HAD BEEN PLACED IN 

 A BENCH INFECTED WITH Rhizoc- 

 tonia Solani FROM CARNATION (Ex- 

 periment 9) 



