Sept, i, 1921 
Transmission of Some Wilt Diseases in Seed Potatoes 847 
Fusarium radicicola occurs frequently in potato tubers in Oregon, 
though it usually does not produce any apparent ill effects. It is often 
associated with a slight and generally rather dry, withered endrot or a 
soft and moist endrot, but it is not believed to be the sole cause of this 
trouble. It is more often found in tubers that are sound, except for 
having discolored vascular regions near the stem end. 
A stem-end rot of potato tubers, varying from a mere withering of the 
stem end to a dry, withered, brown to black rot, or to a soft jellylike 
light brown rot, occurs rather commonly during some seasons in western 
Oregon. It appears to be due as much to climatic conditions during 
the growing season as to the presence of any certain parasitic organisms. 
LITERATURE CITED 
(1) Bisby, G. R. 
1919. STUDIES ON FUSARIUM DISEASES OF POTATOES AND TRUCK CROPS IN 
MINNESOTA. Minn. Agr. Exp. Sta. Bui. 181, 58 p., 30 fig. Bibli¬ 
ography, p. 40-44. 
(2) Carpenter, C. W. 
1915. SOME POTATO TUBER-ROTS CAUSED BY SPECIES OF FUSARIUM. In Jour. 
Agr. Research, v. 5, no. 5, p. 183-210, pi. A-B (col.), 14-19. Liter¬ 
ature cited, p. 208-209. 
(3) Chandler, W. H. 
1914. SAP STUDIES WITH horticultural plants. Mo. Agr. Exp. Sta. Research 
Bui. 14, p. 489-552 incl. 13 pi. Bibliography, p. 535-539. 
(4) Edson, H. A. 
1920. VASCULAR DISCOLORATION OF IRISH POTATO TUBERS. In Jour. Agr. 
Research, v. 20, no. 4, p. 277-294. 
(5) Heald, F. D. 
1917. POTATO GROWING IN WASHINGTON. PART II. POTATO DISEASES. Ill Wash. 
Agr. Exp. Sta. Pop. Bui. 106, p. 15-94, fig. 1-26. 
(6) MacMillan, H. G. 
1919. FUSARIUM-BLIGHT OF POTATOES UNDER IRRIGATION. In Jour. Agr. 
Research, v. 16, no. 11, p. 279-304, pi. 37-41. Literature cited, p. 
3 °i- 303 - 
(7) Orton, W. A. 
1914. POTATO WILT, LEAF-ROLL, AND RELATED DISEASES. U. S. Dept. Agr. 
Bul. 64, 48 p., 16 pi. Bibliography, p. 44-48. 
( 8 ) Pethybridge, George H. 
1916. investigations on potato diseases, (seventh report.) Dept. Agr. 
and Tech. Instr. Ireland Jour., v. 16, no. 4, p. 564-596, 16 fig. on 12 
pi. 
( 9 ) - 
1916. THE VERTICILLIUM disease OF THE POTATO. In Sci. Proc. Roy. Dublin 
Soc., n. s. v. 15, no. 7, p. 63-92, pi. 2-3. 
(10) Pratt, O. A. 
1916. A WESTERN FIELDROT OF THE IRISH POTATO TUBER CAUSED BY FUSARIUM 
^ ^ radicicola. In Jour. Agr. Research, v. 6, no. 9, p. 297-310, pi. 34-37. 
1918. SOIL FUNGI IN RELATION TO DISEASES OF THE IRISH POTATO IN SOUTHERN 
IDAHO. In Jour. Agr. Research, v. 13, no. 2, p. 73-100, 4 fig., pi. A-B 
(col.). Literature cited, p. 98-99. 
