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Table 1 Wheat stem rust infection types used in disease assessment for seedling stage

From: A case study of non-traditional treatments for the control of wheat stem rust disease

Host response (class) Infection type Disease symptoms
Immune 0 No uredia or other macroscopic sign of infection.
Nearly immune 0; No uredia but hypersensitive necrotic or chlorotic flecks present.
Very resistant 1 Small uredia surrounded by necrosis.
Moderately resistant 2 Small to medium uredia surrounded by chlorosis or necrosis.
Moderately susceptible 3 Medium-sized uredia that may be associated with chlorosis.
Very susceptible 4 Large uredia without chlorosis or necrosis or rarely necrosis.
Heterogeneous X Random distribution of different variable-sized uredia on single leaf.