MAIZE SMUT 



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

 quently remains intact after harvest. Steeping the seed in 



^1^/ ill 



Fig, 51. — Ear of barley attacked Ijy Ustilago hordei. 



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

 also does the hot-water treatment. 



Ustilago nifda, Jensen. — This species also attacks culti- 



