Efficacy of plant extracts and Trichoderma spp in the management of sheath blight of paddy (Oryzae sativa L.)

Abstract

An experiment was conducted to evaluate the effect of plant extracts, bioagents and fungicide in vitro and in situ against Rhizotonia solani causing sheath blight of paddy. Propiconazole @ 0.1% was effective in the inhibition of mycelial growth (85.21%) of Rhizotonia solani. Among the bio-agents, Trichoderma harzianum was found effective in the inhibition of mycelial growth (63.37%) followed by Trichoderma asperellum in inhibition (58.16%) of mycelial growth. Among the plant extracts, neem leaf extract @ 10% was found effective in the inhibition of mycelial growth (48.71%) followed by garlic bulb extract @ 10% (46.13%) and tulsi leaf extract @ 10% (34.38%). The plant extracts, potential bio-agent and fungicide found effective in vitro were tested as foliar spray against sheath blight of paddy under field conditions during kharif season 2016-2017. Among all the treatments foliar spray of propiconazole @ 0.1% as treated check was found effective in the disease reduction (57.59%), followed by neem leaf extract @ 10% (44.24%), garlic bulb extract @ 10% (37.61%). followed by tulsi leaf extract @ 10% was found effective in disease reduction (27.60%). Among the bio agents, Trichoderma harzianum @ 1% with (17.19%) and Trichoderma asperellum @ 1% (10.82%).