PLATE 3 
A. —(i and 2) Curly-dwarf Green Mountain. Source of inoculum for inoculations 
with aphids in cages in 1921. (Inoculated Green Mountain in B.) 
B. —(1) Spindling-tuber vine from same 1921 hill as curly-dwarf plant, but infected 
with only one disease from the combination. (2) Curly-dwarf or spindling-tuber leaf- 
rolling mosaic plant. Second generation to aphid inoculation in cages (source of 
inoculum in A). Variety Green Mountain. 
C. —Rugose mosaic and healthy Irish Cobbler vines. Mosaic plant is progeny from 
vine apparently showing streak the previous season. 
