Semi-Centennial Volume. 133 



black on the grlumes, make it conspicuous at heading time. A symptom 

 more or less directly connected with the disease is the exuding of drop- 

 lets from infected areas. Some seasons the seed of infected plants be- 

 comes shrivelled, but the extent of damage and the prevalence of this 

 disease in Kansas seems quite dependent upon certain weather condi- 

 tions. A bacterial trouble closely associated with this occurs on the 

 foliage, but prior to the black chaff and stem disease symptoms on the 

 wheat heads. Whether this is all one and the same disease is not 

 definitely known. The black chaff and stem disease of wheat was 

 observed in many places in the state in 1917, but was most abundant in 

 Manhattan. Practically no loss was sustained in the fields where it 

 occurred this year. 



Stem Rust of Wheat. Puccinia graminis tritici. Only slight infections 

 of stem rust were recorded in the state the past season. No fields showed 

 more than a trace. 



Leaf Rust of Wheat. Puccinia triticiiia Erikss. This was present 

 everywhere on the leaves of the wheat crop at heading time. In many 

 localities it did not appear in the fall of 1916. 



Covered Smut of Barley. Ustilago harder (Pers.) K. & S. This dis- 

 ease occurs quite consistently in most fields of barley, where seed treat- 

 ment has not been given. The average per cent of this fungus in the 

 field is about four. 



Loose Smut of Barley. Ustilago nnda (Jens.) K. & S. This fungus 

 is more abundant in the barley crop than the loose smut of wheat is in 

 the wheat crop. The loose smut of barley is generally found in every 

 barley field, the percentage running close to four per cent for an 

 average. 



Leaf Rust of Barley. Puccinia simplex Erikss. & Henn. This is the 

 most uncommon of the cereal leaf rusts in the state. Generally small 

 amounts can be found each season. 



Loose Smut of Oats. Ustilago avense (Pers.) Jens. This disease is the 

 most common of the oat diseases. It is very common to find eight per 

 cent of the crop affected with loose smut. Since oat seed treatment is be- 

 coming more generally used, the losses are not as great as they formerly 

 were. 



Covered Smut of Oats. Ustilago levis K. & S. Magn. This smut like- 

 wise occurs in this state, but not as commonly as the loose smut. Both 

 oats smuts can frequently be found in the same field. 



Blade Blight of Oats, Bacterial. What seems to be a bacterial 

 disease of oats was rather conspicuous the past season. Whether this 

 is the same as the organism described by Manns ' is not known. Dis- 

 tinct bacterial infections can be noticed. Sometimes this is accompanied 

 by a reddish coloration of the foliage. 



Leaf Rust of Oats. Pxcciyiia lolii avense McAlpine. This rust was 

 present in moderate amounts the past season. No damage to the crop 

 was reported. 



Rye. {Bacterial disease.) A conspicuous trouble was noticed on the 

 rye crop the past season. Droplets of bacterial ooze were noticed on 



' Manns. T. F. Ohio Bull 210. 1909. 



