Data presented in Table (3) reveals
that pendimethalin at X and 2X concentrations produced maximum radial growth of
Trichoderma sp. (Fig.1) at all the intervals in
general and were at par with metolachlor at
0.5X concentration. Herbicides like butachlor,
alachlor, metolachlor (except 0.5 X) and
metribuzin on an average, resulted in similar
radial growth like control. Pendimethalin at
0.5X concentration reduced the radial growth
of Trichoderma sp. Anilophos at 0.5X and 2X
concentration produced at par radial growth
like control. Whereas, at X concentration it
reduced the radial growth of Trichoderma sp.
Oxadiargyl at all the concentrations significantly
reduced the radial growth and higher concentration
of this herbicide was found more
inhibitory than the lower concentration.
The inhibitory effect of pendimethalin at 0.5X
concentration and inducible effect at X and
2X concentrations on the radial growth of
bioagent may be due to the utilization of
herbicide as a nutrient source by the fungus at
higher concentration.