Efficacy of Botanicals and Bioagents against Rhizoctonia solani Causing Wet Root Rot of Coriander

Abstract

A laboratory study was conducted at Department of Plant Pathology, College of Agriculture, Latur, VNMKV, Parbhani, Maharashtra, India. during kharif/ Monsoon season of 2024-25 to study Wet root rot of coriander Caused by Rhizoctonia solani of Coriander. Here, in vitro efficacy of Botanicals & Bioagents were assessed against Rhizoctonia solani causing wet root rot of coriander. Among eight aqueous plant extracts, Garlic (Allium sativum) was found most effective, achieving 100 % mycelial inhibition at both 10 % and 20 % concentrations. Mehendi (Lawsonia inermis) and Tulsi (Ocimum tenuiflorum) followed with 77.21 % and 45.40 % inhibition at 10 % and 95.55 % and 100 % at 20 %, respectively. Aloe vera (Aloe barbadensis) and Neem (Azadirachta indica) showed less inhibition, indicating ineffectiveness against R. solani. Biological agents also exhibited promising results. Trichoderma harzianum showed the highest inhibition (92.77 %) with mycelial growth reduced to 24.00 mm, followed by Trichoderma hamatum (89.89 %) and Trichoderma asperellum (87.40 %). Moderate inhibition was recorded for Aspergillus flavus (52.07 %) and Aspergillus niger (31.29 %), while Pseudomonas fluorescens and Bacillus subtilis were least effective, with 15.45% and 8.30 % inhibition, respectively.