PIRATE z 
Types of susceptibility shown by rye plants to leaf rust, Puccinia dispersa . All 
natural size. 
A. —Leaf showing the resistance of rye plant 9. Note the hypersensitive areas and 
the small uredinia. 
B. —Leaf showing the high resistance of rye plant 8. Note the few hypersensitive 
areas and lack of uredinia. 
C. —Leaf showing the susceptibility of rye plant 7. Note the large uredinia and 
lack of hypersensitiveness. 
D. —Leaf showing the susceptibility of rye plant 10. Note the large uredinia and 
lack of hypersensitiveness. 
E. —Leaf showing the moderate resistance of rye plant n. Note the hypersensitive 
areas and the large uredinia accompanying each. 
