The definitions, values and dimensions of model parameters^a.

aParameter values were taken from [18], except for parameters , , and . The estimation of the values of these parameters is described in the text. bThe character ‘t’ represents degree-days. cLower leaves are leaves that emerged before leaf 3, when counting down from the flag leaf (flag leaf = 1). dA compound parameter which combines the infection efficiency and the probability of a spore landing on the upper leaves of the canopy (see text). eDimensionless. fSee the text for the range of values of parameters , and in the simulations.