Test of Pathogenicity. Fusarium oxysporum was taken
from 10-days culture of 100 ml PDB. Fungal suspension
was blended with 500 g sterilized soil mixed with sterilized
compost (3:1) in a 30 x 22 x 10 cm tray. Chili seeds were
surface sterilized with 2% aqueous sodium hypochlorite
for 60 minutes and rinsed thoroughly with sterile distilled
water. The seeds were then planted for 30 days in the
trays covered with plastic wrap. Control seeds were treated
similarly but in soil without fungal inoculation. Thirty
seeds were used for each treatment. Direct observation
was conducted to know percentage of infected seedlings.
The test was done twice. The percentage of red chili
seedling damping-off was observed as [number of seedling
dumping-off / number of treated seeds] x 100%.
Fungal reisolation was conducted from sample of
infected seedlings. Samples were taken by cutting the
collar stem, sterilizing with 2% aqueous sodium
hypochlorite, and rinsing thoroughly with sterile distilled
water prior inoculating to PDA. Direct and microscope
observation was conducted to see the reisolated fungal.