Stem rust infection type seedling NA16 A qualitative analysis of the type of disease symptoms exhibited by seedlings inoculated with stem rust (Puccinia graminis f. sp. avenae) race NA16 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. entity acronym scale_of method_of attribute variable_of