Evaluation of the regression model of daily-observed versus daily-simulated airborne conidia concentrations of Bremia lactucae in a lettuce field.

n, number of simulations; R2, coefficient of determination; Ubias, differences between the observed and simulated airborne conidia; Uslope, deviations from the 1:1 line; Uerror, the unexplained variance.n：模拟次数（number of simulations）；R2：决定系数（coefficient of determination）；Ubias：实测气传分生孢子与模拟气传分生孢子间的差值；Uslope：与1:1参考线的偏差；Uerror：未解释方差（unexplained variance）