RPA, RHA, CMA, and CA media
have been reported to give satisfactory
conidial production by B. oryzae (2,11),
but they did not support significant
sporulation of the five isolates we tested
(Table 2). B. oryzae sporulated
abundantly on RFA with most of the
light treatments. The 12-hr cycle of black
light followed by dark was the most
effective treatment.
When four additional isolates of B.
oryzae were tested on RFA, they all
consistently produced high numbers of
conidia (Table 2).