PLATE 3 



A.— Fusarium seedling-blight. The normal plant is on the left. The other five 

 show the gradations in blighting caused by Gibberella saubinetii. 



B. — Tissue invaded by G. saubinetii in causing the headblight of wheat. Each 

 group includes the four consecutive sections which, after surface sterilization, were 

 cut from the upper internode of a wheat culm having a blighted head, the left segment 

 in each group being the upper. These were then incubated on agar plates. Note that 

 only the sections nearest the head were invaded by the fungus. 



