CEREALS 



355 



with a dark green powder. Sometimes a yellow color pre- 

 vails instead of the green. In section the interior is seen 

 to be filled with a compact white mass, bordered by a brown- 

 ish yellow zone, then by the 

 green coating. Though the 

 disease has been known in 

 Louisiana for ten or more 

 years, and is there present to 

 some extent in most fields, it 

 is not considered serious, since 

 rarely more than 0.25 per cent 

 of the heads, and only a few 

 grains per head, are affected. 



Black smut {Tilletia horrida 

 Tak.). — A smut upon rice 

 received by Anderson ' from 

 Georgetown, S.C, in 1898, was 

 reported as darkening flour 

 made from rice from affected 

 fields. Many heads bore as 

 much as 25 per cent of smutted 

 grains. In Louisiana it is also 

 reported, but not usually in 

 amounts to cause much loss. 



This smut was probably imported from Japan in infected 

 seed, but due to the immediate action of Anderson and 

 Walker the pest seems to have been completely stamped 

 out in South Carolina within the first few years after its 

 advent. No reports whatever of its presence there have 

 been made since 1903. 



Fia. 152, — Rice showing black smut. 

 After Fultofl. 



1 Anderson, A. P., S.C. Agr. Exp. Sta. Bui. 41, March, 1899. 



