Magnaporthe oryzae sexual crosses on rice flour agar medium. Design of the crosses and schematic diagram of results (A and B). A. Two lines of perithecia are produced between each tested strain and each reference strain: the tested strains are female-fertile and male-fertile. B. A single line of perithecia is produced between each tested strain and each reference strain: the tested strains are female-sterile and male-fertile. C and D: crosses of evolved strains derived from S3 at three different asexual generations (1, 2 and 10) with the two reference strains S1 and S2. C. Tests with S3-A1 and S3-A2: both strains are female-fertile. D. Tests with S3-A10 (same strain tested twice): the strain is female-sterile.