One hundred for each of dry seeds, water soaked (24 hrs) seeds, sprouted seeds, four-day-old
seedlings (3.5 - 4.0 cm tall) and seven-day-old seedlings (8.0 - 8.5 cm tall) of a known susceptible
BR-26 were placed into 8 ml of SS (5×1010 conidia/ml) in Petri plates (90 mm dia.). Among the
treatments, first three were seed inoculation and last two were root deep method. The Petri plates
were cultured in vitro at room temperature under fluorescent light for 10 days. From the 3rd day of
inoculation requisite amount of sterilized distilled water was added into the plates to prevent
desiccation. Everyday room temperature was recorded with a digital thermometer. Thereafter, the
percentages of over growth rate (OGR), death rate, lankiness and color of the rice specimens were
determined. Effects of different inoculum concentration (SS 1-5), sterilized corresponding
suspension filtrate (SCSF), autoclaved spore suspension (ASS) and 9 different concentrations
(0.001-1000 ppm) of GA3 on BR-26 were also carried out in the same manner as described above.