moderately susceptible (MS), medium-sized pustules, no necrosis, but some clorosis possible MS S susceptible (S), large pustules, no necrosis or chlorosis 0 no visible infection (0) R resistant (R), necrotic areas with or without small pustules variable_of acronym scale_of R-MR resistant to moderately resistance (R-MR) attribute intermediate (M), pustules of variable size, some necrosis and/or chlorosis I entity moderately susceptible to susceptible (MS-S) MS-S method_of moderately resistant (MR), small pustules surrounded by necrotic areas MR 1-8 rust field response scale