Daily thresholds for calculation of the proportion of diseased tissues with the probability-based approach. Two weeks-old bean plants cv. Flavert were inoculated with either Xff CFBP4834-R (1.106 CFU ml_1) or mock. A: Pixel-wise Fv/Fm-distributions at 1, 7 and 11 dai of mock-inoculated leaflets (black) and Xff CFBP4834-R-inoculated leaflets (grey). The expert-based thresholds (dotted bars) are fixed over the whole experiment. Conversely, the probability-based thresholds (solid bars) may vary each day of the experiment, thereby taking into account daily physiological variations of plants. B: Evolution of the percentage of diseased areas on mock-inoculated (black curve) and Xff CFBP4834-R-inoculated (grey curve) leaflets calculated with probability-based thresholding approach.