Stem rust infection type seedling NA55 A qualitative analysis of the type of disease symptoms exhibited by seedlings inoculated with stem rust (Puccinia graminis f. sp. avenae) race NA55 during greenhouse trials. Ratings made using the scale from Stakman et al. (1962): immune= 0, very resistant= 1, moderately resistant= 2, moderately susceptible= 3, and very susceptible= 4. acronym scale_of attribute variable_of entity method_of