Vol. 11, Issue 5 (2022)

Author(s):
Rashmi Nigam, Pradeep Saxena, Joginder Singh and Rajendra Singh

Abstract:
The efficacy of biological control agents on dry weight of cowpea (Vigna unguiculata (L.) Walp) was studied at Bundelkhand region. Study reveals that maximum increase in the dry weight of root was observed due to Trichoderma harzianum followed by Trichoderma viride at various doses. Both the biological agents, Trichoderma harzianum and Trichoderma viride acted more effectively at 10 to15 g dose. The study also reveals that other two Trichoderma species namely Trichoderma pseudokoningii and Trichoderma koningii did not visualize any significant difference in their efficacies when compared from each other. The least effective biological agents were Aspergillus flavus and Aspergillus niger when compared with other bioagents. The data also indicate that the efficacy of all treatments significantly varied at different concentration. However, a gradual increase in dry root weight of cowpea plant was recorded with increase of dose. The most effective dose was recorded as 15g/kg seed dose but a reverse trend was observed at lower dose 2g/kg seed dose.