Bui. 1046, U. S. Dept. of Agriculture 



PLATE XI. 



Check 



Fig. 1. — Rust Resistance of Two Varieties of Winter Wheat in 1918. 



Seedling leaves of P1086 (A) and Kaured (B), both iuoeulated on April 22 and photographed 

 on May 11. Compared with the rusted leaves of the susceptible check (shown at the left of 

 each group) these leaves are seen to be entirely free from flecks and uredinia. 



Fig. 2. — Rust Susceptibility of Two Varieties of Spring Wheat in 1917. 



Seedling leaves: C, Arnautka (C. I. 149.3), inoculated on March 29 and photographed on April 19; 

 J), hybrid .3 X 122A12, showing normal uredinia in ihis stage, inoculated on \\m\ 4 and photo- 

 graphed on April 27. Although known to be resistant to some strains of stem rust in the field, 

 these two varieties show visible signs of infection when inoculated witli the same strain of rust 

 used with ^4 and B (fig. 1, above). 



COMPARATIVE RUST RESISTANCE OF SOME WINTER AND 

 SPRING VARIETIES OF WHEAT. 



