The severity was assigned to five classes according to the
percentage of cherry surface covered by fungal mycelia: 0, uninfected
cherry; 1, surface mycelia just visible to 25% of the cherry
surface; 2, 26% to 50% of the cherry surface covered with mycelia;
3, 51% to 75% of the cherry surface covered with mycelia; and 4,
>75% of the cherry surface covered with mycelia