PLATE 2 
Marquis wheat seedlings, healthy and artificially infected with Helminthosporium 
sativum. 
A. —Healthy plants from 115 disinfected kernels sown in steam-sterilized, unin¬ 
oculated soil. 
B. —Infected plants, same age as A, from 115 disinfected kernels sown in part of 
the same lot of soil inoculated at sowing time with a water suspension of conidia of 
H. sativum grown in pure culture (culture 51a) isolated from wheat. 
