FIG. 3.

Observed values and modeled curve of the radial growth in vitro of P. aphanidermatum in response to low doses of propamocarb. Radial growth is expressed as percentages relative to a non-amended control, and concentrations as natural logarithm of ppm. Each data point in the figure represents the mean value of five replicates. Arrows indicate the natural logarithm of the EC₅₀ (14.91 ppm), NOAEL (1.77 ppm) and MSD (0.64 ppm). The slope of the curve at the EC₅₀ (β) was 1.37 and the rate of increase at low doses (γ) was 35.17. Low-dose stimulation was observed.