PLATE 6 
Adjacent plots of Reid Yellow Dent planted at the same time, on uniform soil, 
and photographed on the same day, at Urbana, Ill. 
A. —Plot grown from moderately diseased seed. This plot contained a large per¬ 
centage of weak plants. 
B. —Plot grown from nearly disease-free seed. This plot had 55 per cent more 
vigorous plants than the plot shown in A. 
