acronym M intermediate:†variable sized uredia are present, some with chlorosis, necrosis, or both. moderately resistant:†small uredia are present and surrounded by either chlorotic or necrotic areas. MR susceptible:†large uredia are present, generally with little or no chlorosis and no necrosis. S method_of attribute 0 no visible infection on plant. R resistant:†visible chlorosis or necrosis, no uredia are present. MS moderately susceptible:†medium sized uredia are present and possible surrounded by chlorotic areas. scale_of entity variable_of Rust response scale