Evaluation of Trichoderma species against Fusarium udum Butler causing wilt of pigeonpea

摘要

One isolate each of Trichoderma viride, Trichoderma harzianum and Trichoderma virens were evaluated against twelve isolates of Fusarium udum collected from different districts of Bihar, Jharkhand and West Bengal by dual culture technique. All the bioagents inhibited the growth of E udum in vitro. Dholi isolate of T. harzianum inhibited the growth of E udum isolates Fu-5, Fu-12, Fu-14, Fu-21, Fu-24, Fu-27 and Fu-43 by 40.8, 74.5 ,49.4, 59.1, 60.5,40.8 and 57.8 per cent, respectively and proved superior to other antagonists. T. viride was found to have potential in inhibiting the radial growth of E udum isolates Fu-29, Fu-37, Fu-49 and Fu-57 while T. virens was more effective in inhibiting the growth of Fu-61. Combined application of T. harzianum andT. viride as seed treatment and soil application gave minimum disease incidence (26.4%) and maximum disease control (56%) followed by 54% disease control in T. harzainum seed treatment and soil application. However, these two treatments were on par witheach others. The results also revealed that soil application of bioagents was more effective than seed treatment.