. Journal of Agricultural Research. Journal of Agricultural Research Washington, D. C. PLATE lo A.—(i) Dwarfed Irish Cobbler plant. (2) Unmottled curly-dwarf Green Mountainhill diseased as result of aphid inoculation in preceding season from parent ofplant (A, i). B.—(i) Healthy plant and corresponding tuber progeny. (2) Plant and cor-responding tuber progeny infected with spindling tuber. Healthy and diseasedplants from Rose 4 variety. C.—Parts of the same Green Mountain strain. In left center, spindling-tuber seedpotatoes planted. On right, all-mosaic seed potatoes planted. August 20, 1918.

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. Journal of Agricultural Research. Journal of Agricultural Research Washington, D. C. PLATE lo A.—(i) Dwarfed Irish Cobbler plant. (2) Unmottled curly-dwarf Green Mountainhill diseased as result of aphid inoculation in preceding season from parent ofplant (A, i). B.—(i) Healthy plant and corresponding tuber progeny. (2) Plant and cor-responding tuber progeny infected with spindling tuber. Healthy and diseasedplants from Rose 4 variety. C.—Parts of the same Green Mountain strain. In left center, spindling-tuber seedpotatoes planted. On right, all-mosaic seed potatoes planted. August 20, 1918. PLATE II A.—Healthy branch on an unmottled curly-dwarf plant. Variety Green Mountain. B.—(i, 4) Healthy, and (2, 3, and 5) unmottled curly-dwarf plants, variety GreenMountain. Infection produced in first generation by leaf mutilation with juice fromunmottled curly-dwarf Irish Cobbler. C.—Foliage from Green Mountain plant showing streak. Degeneration Diseases ot Irish Potatoes Plate 11. 11^ 1 ^ -J S^^ 1 r,-1

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