120 



FUNGOUS DISEASES. 



serious inroads in different localities. Fig. 24 

 shows a field of cabbage in Racine, Wisconsin, dev- 

 astated by the rot, from which not a single head 

 was harvested. 



While the disease is more important in its rela- 

 tion to cabbage culture, on account of the relative 

 amount of this crop grown, it also affects a number 

 of allied species that belong to the same genus. 



Fig. 24 Cabbage Field Destroyed by the Rot. 



Besides cabbage and cauliflower, kohl-rabi, kale, 

 Brussels sprouts, broccoli and collards are attacked 

 by it, and to a lesser extent it develops in turnips, 

 rutabagas, winter radish and other closely related 

 vegetables. 



Symptoms and Cause. The first indication of 

 the disease is upon the outer leaves of the cabbage 

 and cauliflower, which turn yellow and die in spots, 



