PLATE 2 
A. —Greenhouse-grown progeny of a net-necrosis tuber from Green Mountain stock 
(lot 1919-125 of Table VI) showing net-necrosis and leafroll the preceding season. 
B. —Tuber with part of stem end cut away to show net-necrosis. (From lot 1920-V 
of Table VI). The two deep holes are due to elimination of the effect of insect 
injury. 
