The effect of daily periods of RH 2 95% on sporulation was investigated using the same procedures described above, except that daily RH periods 295% were used instead of different temperatures. The daily RH periods 295% were 4, 8, 12, 16, 20, and 24 hr/ day for a total of 10 days. When not exposed to RH periods 295%, lesion disks were placed in an incubator at 20 C and 60~70% RH