PLATE 3 
Wheat seedlings attacked by wheatscab fungus, Gibberella saubinetii , and Petri-dish 
cultures of the same fungus incubated six days at different temperatures. 
A. Winter wheat (Turkey) seedlings from artificially inoculated seed, taken from 
the field late in the fall. Th€ blackened, rotted roots resulted from the progress of the 
disease early in the season while the soil was warm. The new, white, healthy roots 
developed later in the season while the soil was cool. 
B. —Blighted seedlings of Marquis wheat from artificial inoculation, taken from the 
field in the spring. The first two seedlings (left) represent typical blighting before 
emergence. The seedling on the right was blighted in the first-leaf stage. 
C. —Relation of temperature to the vegetative development of G. saubinetii. Petri- 
dish cultures of the fungus incubated six days on unacidified, potato-dextrose agar 
at temperatures from 4° to 35 0 C., as indicated by figure below each culture. 
