Fig 6. Relationship between relative cultivar seed yield (RY, %) and relative cultivar phoma stem canker severity (RS, %).

The relationship was fitted (broken short line) by the logistic equation ($RY=39.54+\frac{70.50}{1+{0.0056\left(RS\right)}^{5.23}}$) using the data from winter oilseed rape field experiments at 13 sites (see Table 1) in three growing seasons (2010/2011, 2011/2012, 2012/2013).