MAIZE SMUT 



215 



surrounded by the unbroken walls of the ovary, and fre- 

 quently remains intact after harvest. Steeping the seed in 



1 



Fig. 51. Ear of barley attacked by Ustilago hordei. 



a half per cent, copper solution prevents the disease, as 

 also does the hot-water treatment. 



Ustilago nuda, Jensen. This species also attacks culti- 



