404 
Journal of Agricultural Research 
Vol. XXI, No. 6 
other color. With respect to form of seed all varieties of the marrow 
type were rust resistant and those with pea beans constituted the most 
susceptible class. 
Little or no variation in the susceptibility of individuals was found 
in the majority of the varieties studied, but marked variation existed 
between individuals in a few varieties. 
Field tests which have supplemented the greenhouse tests have 
demonstrated that the greenhouse test affords a reliable index of the 
field behavior of a variety with respect to rust infection. An attack 
of rust on susceptible varieties in the field may result in a curtailment 
of production amounting to 50 per cent or more, and in very severe 
attacks to total loss. 
The existence of two biologic forms of the bean-rust fungus has been 
demonstrated, but their host ranges are as yet imperfectly known. 
LITERATURE CITED 
(1) Arthur, Joseph Charles. 
1907-1912. uredinales. In North. American Flora, v. 7, no. 2, p. 83-160; 
no. 3, p.257. 
(2) Duggar, Benjamin Minge. 
[1909]. FUNGOUS DISEASES or PLANTS. 508 p., 240 fig. Boston. 
(3) Fromme, F. D. 
1913. the CULTURE OF CEREAL RUSTS in THE GREENHOUSE. In Bill. Torrey 
Bot. Club, v. 40, no. 9, p. 501-521. Literature,p. 519-521. 
(4) -and Wingard, S. A. 
1918. BEAN RUST. Va. Agr. Exp. Sta. Bui. 220, 18 p., illus. 
(5) Gassner, Gustavo. 
1909. ALGUNAS OBSERVACIONES SOBRE EL “POLVILLO” DE LOS POROTOS 
(uromyces APPENDICULATUS). In Rev. Secc. Agron. Univ. Monte¬ 
video, no. 4, 1908, p. 125-129, illus. 
(6) Jarvis, C. D. 
1908. AMERICAN varieties of beans. N. Y. Cornell Agr. Exp. Sta. Bui. 
260, p. 149-255, illus., 16 pi. (1-3 col.). 
(7) Jordi, Ernst. 
1916. UBER DIE EMPFANGLICHKEIT VON PHASEOLUS VULGARIS L. FUR BOHNEN- 
rost. In Ztschr. Pflanzenkr., Bd. 26, Heft 6/7, p. 374-375. 
(8) Melhus, I. E., and Durrell, L. W. 
1919. STUDIES ON THE crown rust of oats. Iowa Agr. Exp. Sta. Research 
Bui. 49, 144 p., 6 fig. Bibliography, p. 143-144. 
(9) Morse, W. J. 
1918. RUST CAUSED BY UROMYCES APPENDICULATUS. MAINE. In U. S. Dept. Agr. 
Bur. Plant Indus. Plant Disease Bui., v. 2, no. io, p. 174. 
( 10 ) Reddick, Donald, and Stewart, Vern B. 
1918. varieties of beans susceptible to mosaic. In Phytopathology; 
v. 8, no. 10, p. 530 - 534 - 
(11) Smith, Ralph E. 
1914. PLANT PATHOLOGY. In Calif. Agr. Exp. Sta. Rept. 1913/14, p. 139-142. 
