684 Journal of Agricultural Research voi.xx, No. 9 



The discovery of Sclerospora spontanea on wild Saccharum spontaneum 



is, in so far as the writer is aware, the first record of the occurrence of a 



conidial Sclerospora on a wild host in the Orient. This occurrence, in 



connection with other data, seems to the writer to indicate that the wild 



grasses are the natural hosts of these oriental downy mildews from which 



they have passed and are passing to susceptible introduced crops such 



as maize. 



LITERATURE CITED 



(1) Butler, E. J. 



1913. THE DOWNY MILDEW OF MAIZE (SCLEROSPORA MAYDIS (RAC.) BUTL.). 



In Mem. Dept. Agr. India Bot. Ser., v. 5, no. 5, p. 275-280, pi. 8-9 

 (icol.). 



(2) Davenport, C. B. 



1904. STATISTICAL METHODS, WITH SPECIAL REFERENCE TO BIOLOGICAL VARIA- 

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(3) Davenport, Eugene. 



[01907]. principles OF breeding. 727 p., illus. Boston, New York. 



(4) Fawcett, Howard S. 



191 7. preliminary note on the relation of temperature to the growth 



OF certain parasitic fungi in cultures. In Johns Hopkins Univ. 

 Circ. 203 (n. s., 3), p. 193-194- 



(5) Gaumann, Ernst. 



1918. UBER DIE FORMEN DER PERONOSPORA PARASITICA (PERS.) FRIES. In 



Beih. Bot. Centralbl., Bd.35, Abt. 1, Heft 3, p. 395-533, 47 fig- Zitierte 

 Literatur, p. 531-533. 

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1918. UBER DIE SPEZIALISATION DER PERONOSPORA AUF EINIGEN SCROPHULARIA- 



CEEN. In Ann. My col., v. 16, no. 1/2, p. 189-199, 6 fig. Zitierte Litera- 

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 (7) 



1918. UBER DIE SPEZIALISATION DER PERONOSPORA CALOTHECA DE BARY. 



In Svensk Bot. Tidskr., Bd. 12, Hafte 4, p. 433-445, 2 fig. Literatur- 

 verzeichnis, p. 445. 



(8) Ideta, Arata. 



1914. handbuch der pflanzenkrankheiten japans. Ed. 4 enl., 936 p., 



illus., 24 pi. (8 col.). Tokyo. 1909-11. Text in Japanese; indexes 

 and bibliography (7 p.) in German, etc. Added title-pages in Japa- 

 nese, English, and French. A second Japanese t.-p., states that 

 this is ed. 6, 1914. 



(9) Miyake, Tsutome. 



191 1. ON A FUNGUS DISEASE OF SUGARCANE CAUSED BY NEW PARASITIC 



fungus, sclerospora sacchari T. miy. In Rpt. Sugar Exp. Sta- 

 Govt. Formosa, Div. Path. Bui. 1, 61 p., 9 pi. In Japanese. 



(10) Palm, Bj. 



1918. onderzoekingen over de omo lijer van de mais. (With an English 

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(11) Rosenbaum.J. 



1917. studies of the genus phytophthora. In Jour. Agr. Research, v. 8. 

 no. 7, p. 233-276, 13 fig., pi. 71-77. Literature cited, p. 273-276. 



(12) Weston, William H., Jr. 



1920. Philippine downy mildew OF maize. In Jour. Agr. Research, v. 19, 

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