To observe the antagonistic effect of T. harzianum
against R. solani, both were tested on PDA using the dual
culture technique (Table 3). All 20 isolates of T. harzianum
showed more than 50% ofinhibition ofthe radial growth of
the test pathogen compared to control. Among the
isolates, STA7 showed significantly highest inhibition
(71.97%) of the radial growth, followed by STA9 (68.91%)
and STA5 (66.85%). The lowest 51.24% radial growth
inhibition was observed at STA17. The isolate STA7 was
selected for further study.