PLATE i 
Gibberella saubinetii on crop refuse 
A. —Winter wheat sown on corn land. The cornstalks were broken down with a 
drag, after which the field was disked both ways and then plowed. Enough diseased 
stalks remained on the surface to carry scab to the entire wheat crop if weather con 
ditions were favorable for the development of scab during and immediately following 
the blossom period. 
B, C.—Penthecia of Gibberella saubinetii on cornstalks and stubble left on the surface 
of the soil. 
D.—Perithecia of Gibberella saubinetii on wheat stubble and straw which was found 
on the surface of the ground in the vicinity of a straw stack. 
(880) 
