PLATE 48 



Chevalier barley plants from untreated and treated seed referred to in Table III: 



A. — Plants from untreated seed. At left are illustrated the 21 plants showing the 

 most marked evidence of Helminthosporium sativum primary infection: leaf lesions, 

 basal browning, and root rotting. At right are illustrated the other 64 plants showing 

 less marked evidence of infection. Roots and kernels, however, show considerable 

 discoloration. 



B. — Plants from seed treated with dry heat. No diseased plants whatever; all 

 71 plants are clean and roots bright. 



Approximately one-third natural size. 



