. Journal of Agricultural Research. some degenerate strains op potatoes. n. y.(Geneva) Agr. Exp. Sta. Bul. 422, p. 319-357, 12 pi. (47) and SiRRiNE, F. A. 1915. THE SPINDLING-SPROUT DISEASE OF POTATOES. N. Y. (Geneva) Sta. Bul. 399, p. 133-143. 3 pl- (48) Stuart, William. I915. GROLT CLASSIFICATION AND VARIETAL DESCRIPTIONS OP SOME AMERICAN POTATOES. U. S. Dept. Agr. Bul. 176, 56 p., 19 pi. Reissued 1918, 59 p., 19 pl- (49) TOLAAS, A. G. 1922. MINNESOTA POT.\To CERTIFICATION RULES. In Potato Mag., V. 4, no. 9,p. 10, 18. (50) WORTLEY, E. J. 1918. POTATO LEAP-ROLL: ITS DIAGNOSIS AND CAU
. Journal of Agricultural Research. some degenerate strains op potatoes. n. y.(Geneva) Agr. Exp. Sta. Bul. 422, p. 319-357, 12 pi. (47) and SiRRiNE, F. A. 1915. THE SPINDLING-SPROUT DISEASE OF POTATOES. N. Y. (Geneva) Sta. Bul. 399, p. 133-143. 3 pl- (48) Stuart, William. I915. GROLT CLASSIFICATION AND VARIETAL DESCRIPTIONS OP SOME AMERICAN POTATOES. U. S. Dept. Agr. Bul. 176, 56 p., 19 pi. Reissued 1918, 59 p., 19 pl- (49) TOLAAS, A. G. 1922. MINNESOTA POT.\To CERTIFICATION RULES. In Potato Mag., V. 4, no. 9,p. 10, 18. (50) WORTLEY, E. J. 1918. POTATO LEAP-ROLL: ITS DIAGNOSIS AND CAUSE. In Phytopathology, , p- 507-529, 16 fig. PLATE I A.—(i, 2) Leaves from mosaic Green Mountain plant. (3) Leaf from healt Green Mountain plant. B.—(i) Mild mosaic Green Mountain. (2) Medium plus mosaic Green MountaC.—(i) Healthy plant from half-tuber seed piece. (2) Mild mosaic plant from ah; tuber seed piece. Both from same hill of the preceding season. Green Mount; variety. (118) Degeneration Diseases of Irish Potatoes.
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