6o Journal of Agricultural Research voi. vr, no. i 



LITERATURE CITED 

 Frodin, John. 



1913. Beobachtungen iiber den Einfluss der Pflanzendecke auf die Bodentem- 

 peratur. In Lunds Univ. Arsskr., n. f. afd. 2, bd. 8, no. 9, 16 p., i fig., 

 4 pi. Literatur, p. 15. 

 Masses, George. 



1906. Plant diseases. — IV. Diseases of beet and mangold. In Roy. Gard. Kew, 

 Bui. Misc. Inform., 1906, no. 3, p. 49-60, 5 fig. 

 PammEL, L. H. 



1891. Fungus diseases of sugar beet. In Iowa Agr. Exp. Sta. Bui. 15, p. 234-254, 

 7 pi. 

 Pool, Venus W., and McKay, M. B. 



1915. Phoma betaeon the leaves of the sugar beet. In Jour. Agr. Research, v. 4, 

 no. 2, p. 169-178, pi. 27. 



1916. Relation of stomatal movement to infection by Cercospora beticola. In 

 Jour. Agr. Research, v. 5, no. 22, p. 1011-1038, 6 fig., pi. 80-81. 

 Shaw, H. B. 



1914. An improved cog psychrometer. In Plant World, v. 7, no. 6, p. 183-185, 

 2 fig. 

 Stewart, F. C. 



1913. The persistence of the potato late-blight fimgus in the soil. N. Y. Agr. 



Exp. Sta. Bui. 367, p. 357-361. 

 ThumEn, Felix von. 



1886. Die Bekampfimg der Pilzkrankheiten unserer Culturgewachse. 157 p. 

 Wien. 

 Treboux, O. 



1914. tjberwinterung vermittels Mycels bei einigen parasitischen Pilzen. In 



Mycol. Centbl., Bd. 5, Heft 3, p. 120-126. 



