. Journal of Agricultural Research. Journal of Agricultural Research Washington, D. C. Irish Potato Foliage Degeneration Diseases Plate 2. Journal of Agricultural Research Washington, D. C. ^ 3 PLATE a A.—Plants of the Green Mountain variety exhibiting two types of mosaic symp-^toms, grown in greenhouse, i, showing marked spindling habit and reduced leafsurface accompanied by wrinkling and mottling, the extreme type. 2, foliage nearlynormal as to development but with the characteristic mottling, the mild type. Bothplants are from mild mosaic parentage but from different hills. B.—Young Green M
. Journal of Agricultural Research. Journal of Agricultural Research Washington, D. C. Irish Potato Foliage Degeneration Diseases Plate 2. Journal of Agricultural Research Washington, D. C. ^ 3 PLATE a A.—Plants of the Green Mountain variety exhibiting two types of mosaic symp-^toms, grown in greenhouse, i, showing marked spindling habit and reduced leafsurface accompanied by wrinkling and mottling, the extreme type. 2, foliage nearlynormal as to development but with the characteristic mottling, the mild type. Bothplants are from mild mosaic parentage but from different hills. B.—Young Green Mountain plant showing early the symptoms of extreme in greenhouse bench (1920-21) from parentage designated as healthy butadjacent to mosaic hills, in the experimental field in 1920. C.—Young Green Mountain plant of the extreme type, developing the symptomsvery early in the greenhouse bench (1920-21), from parentage designated as mildmosaic in the experimental field in 1920. From the same tuber as A, i. D.—Young plant apparently healthy at first but later developing mild mosaicsymptoms. From mild mosaic parentag
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