Development of Symptoms and Disease Severity Index (DSI)
Seedlings inoculated with conidial suspensions of isolates of F. fujikuroi from
Malaysia and Indonesia showed typical symptoms of bakanae, thus, the result indicated
that F. fujikuroi is the casual agent of the disease. However, only 93.7% of the
isolates of F. fujikuroi were pathogenic (Table 4). Control plants and plants inoculated
with other Fusarium species remained healthy. The symptom developments on
inoculated seedlings in the greenhouse were similar to those observed in the field.
The first symptoms on rice seedlings inoculated with F. fujikuroi were observed after
5 days. Infected seedlings were several centimeters taller comparing to healthy