PLATE 4 
A. —(i) Rugose mosaic Green Mountain produced by aphids dispersing from rugose 
seedling in cages. (2) Healthy Green Mountain from same 1921 hill as preceding 
infected plant. (3) Rugose mosaic seedling. Source of juice for aphid inoculation in 
cages. 
B. —Rugose mosaic and streaking in top of plant. Variety Green Mountain. 
C. —Green Mountain plant healthy below, leaf dropping in middle, rugose mosaic 
above. 
