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