I: Culture of D, oryzae from freshly isolated in feeted rice
leaves.
II: Culture of D. oryzae transferred 3-4 times at
2--4 week intervals on PDA (potato dextrose agar) con-
taiulng V-8 juice.
III: Original culture of D. oryzae incu-
bated on PDA at 4°CF for 15 months.