To fulfill Koch’s postulates and confirm its pathogenesis,
detached fresh and healthy fruit were used. Unripe whole fruit
(around 4 kg) were washed thoroughly in tap water, surface
sterilised with 70 % ethyl alcohol for 60 s, immediately rinsed
in sterile water, gently wrapped in sterile paper towel, and air
dried inside a clean bench. An agar segment (1 cm2) of a 5-
day-old culture of S. sclerotiorum from PDA plates was
placed on the rind surface. Mycelial blocks were inoculated
separately in four places on each jackfruit. Three replications
were made, and two fruit were tested in each replication.
Altogether, eight points of inoculation were made per replication.
A control treatment was maintained using a PDA block
without the fungul culture. Fruit that were inoculated with
S. sclerotiorum and un-inoculated fruit were kept for 15 days
inside a growth chamber (MLR-351H, Sanyo, Japan), maintained
at 20 °C with 95 % relative humidity and a 12-hour
alternating photoperiod. Whitish fluffy mycelia developed on
the inoculated point within 7 days, and mycelia covered an
area of around 3 to 5 cm of the fruit surface (Fig. 5). After
14 days, up to 50 % of the inoculated side of all of the
inoculated jackfruit was rotten.