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SMUTS OF CEREALS | 
Group x. Infection occurs in the seedling stage of the host. The 
spores are mainly seed borne; in some cases the spores in the 
soil are responsible for infection. 
Bunt or Stinking Smut of Wheat. Tilletia laevis Ieuhn 
Bunt or Stinking Smut of Wheat. Tilletia tritici (Bjerk.) 
Wint. 
Flag or Leaf Smut of Wheat. Urocystis tritici Keke. 
Stem Smut of Rye. Urocystis occulta (Wallr.) 
Rab. 
Bunt of Rye. Tilletia secalis Keke. 
Loose Smut of Oats. Ustilago avenae (Pers.) 
Jens. 
Covered Smut of Oats. - Ustilago levis (K. & S.) 
Maen. 
Covered Smut of Barley. Ustilago hordei (Pers.) 
Kee > 
Covered Kernel Smut of Sorghum.  Sphacelotheca sorghi 
(Link) Clint. 
Loose Kernel Smut of Sorghum. Sphacelotheca cruenta 
(Kkthn) Potter 
Head Smut of Sorghum and Maize. Sorosporium reilianum 
(Kuhn) McAlpine 
Bunt of Rice. Tilletia horrida Tak. 
Group 2. Infection occurs in flowering stage of the host. The 
spores are distributed by the wind at the blooming period of the 
crop and the parasite is carried over as a dormant mycelium in 
the grain. No external contamination of ripe grain occurs. 
Loose Smut of Wheat. Ustilago tritici ( Pers.) 
Jens. 
Loose Smut of Barley. Ustilago nuda (Jens.) 
Kees. 
Loose Smut of Rye. Ustilago secalis (?) 
Group 3. Infection occurs in any young growing tissue of the 
host. The spores are primarily in the soil or barnyard. 
Common Smut of Maize. Ustilago zeae (Beckm.) 
Ung. 
