where R is the ratio of rot damage to the whole berry; H is height of the rotten section or the healthy section according to the rot extension; rG is half the diameter of the inoculated berry prior to inoculation (mm); H1and rD are the height and the half diameter of the rot damage of the berry (mm); H2and rH are the height and the half diameter of the healthy portion (assumed to be a spherical cap) of the berry (mm), respectively.