PLATE 5 
A. —General view showing boxed-in soil plots in foreground and at right and 
galvanized-iron pail series in background at left. 
B. —At left, two pails containing healthy plants of Harvest Queen (Red Cross) 
wheat grown in infested soil that had been disinfected with formaldehyde previous 
to sowing the seed. At right, two pails containing plants of Harvest Queen wheat 
of same age grown in infested soil undisinfected. Healthy seed used throughout* 
Typical rosette disease developed only in the undisinfected soil. 
