Modified log-logistic model1 C. beticola isolate ED50 b2 c3 d4 e5 f6 DMI-sensitive RR-08-418 0.96 0.81 2.34 7.86 0.005 55.53   (1.2)7 (-0.2) (-2) (-2.1) (-0.01) (-53.8) DMI-resistant RR-08-553 34.4 0.81 –4.91 15.15 10.62 24.07   (-45.9) (-0.7) (-10.6) (-1.5) (-10.7) (-26.8) DMI-resistant RR-08-760 35.9 0.84 –4.28 13.67 11.19 22.49   (-52.6) (-0.9) (-10.7) (-1.6) (-11.5) (-26.8) DMI-resistant RR-08-762 21 1.24 –1.55 14.14 10.77 16.22   (-41.6) (-2.7) (-11.3) (-1.6) (-6.2) (-21.1) DMI-resistant RR-08-940 27.7 0.72 –5.04 13.67 4.24 40.68   (-91.4) (-1.3) (-22.1) (-1.5) (-6.4) (-76.3) DMI-resistant GR-10-292 65.6 0.78 –5.39 9.43 9.49 37.82   (-96.7) (-0.6) (-10.9) (-1.5) (-9) (-26.1)

1Modified log-logistic model (CRS.5) with fixed α = 0.25 2 Steepness of the curve after the maximal hormetic effect 3 Lower limit of the dose-response curve 4 Upper limit of the dose-response curve 5 Lower bound of the dose in which growth was reduced by 50% 6 Denotes the theoretical upper bound of the hormetic effect 7 Numbers in parentheses are standard errors

Table 2: Dose-response parameters for C. beticola isolates on potato dextrose agar amended with tetraconazole. Dose-response parameters were obtained using a four-parameter log-logistic model [45] and shown are model parameters and ED50 (medium effective dose reducing growth by 50%) for each C. beticola isolate on PDA amended with tetraconazole and compared with non-amended control.