o(b DISEASES OF ECONOMIC PLANTS 



Leptosphaeriose {Leptosphceria tritici Pass.). — In Ne- 

 braska, Hcald 1 reported a disease in which the lower 

 leaves were killed early in the season, and the whole field 

 was pale in color. The loss was not large. 



Septoriose (Septoriasp.). — Septoriose has been noted by 

 Selby ^ as small, dark spots upon the chaff of certain 

 varieties of wheat. No damage was mentioned. 



Fig. 101. — Wheat kernels; a, normal; b, shrunken and killed by scalj. After 

 Manns. 



Scab (GibhereUa Sauhmetii (Mont.) Sacc). — This scab, 

 first descrilied in 1884 in England, seems to be quite gen- 

 erally distributed in America, and is sometimes, though 

 not usually, the cause of considerable loss. Under condi- 

 tions favorable to the disease the loss may reach 10 per cent. 

 It appears only upon the heads when about half ripe, as yel- 

 low or pink incrustations on the spikelets, on the bases of 

 the glumes, or covering the rachis. The affected spikelets 

 ripen prematurely and turn yellow before the normal parts 



1 Heald, F. D., Neb. Agr. Exp. Sta. Rpt. 19, 46, 1906. 



^ Selby, A. D., Ohio Agr. Exp. Sta. Bui. 97, December 1898. 



