PLATE 6 
A. —Seed pieces of tuber No. 87 exhibiting spindliness of some of the sprouts and 
net-necrosis of the tuber. 
B, C, D, and E.—Plants grown from seed pieces 1, 2, 3, and 4, respectively. Both 
leafroll and mosaic symptoms developed in these plants. A gradual decrease in size 
and vigor is noted in the plants from the middle and stem-end pieces as compared with 
that from the bud end. The bud-end piece showed neither necrosis nor spindliness of 
sprout, but produced, like the others, a diseased plant. 
