Author(s):

Thorlapati Vijaya Vardhan, Sobita Simon and Sunil Zacharia

Abstract: An experiment was conducted to evaluate the effect of plant extracts, bio agents, essential oils and fungicide in vitro and In vivo against Helminthosporium maydis causing Southern leaf blight of maize. Mancozeb @ 0.2% was effective in the inhibition of mycelial growth (100%) of Helminthosporium maydis. Among the essential oils, Lemongrass oil @ 0.2 %was found effective in the inhibition of mycelial growth (100%) followed by neem oil @ 0.1% (57.58%). Among the bio-agents, Trichoderma viride was found effective in the inhibition of mycelial growth (78.89%). Among the plant extracts, lantana camara leaf extract @ 15% was found effective in the inhibition of mycelial growth (70.97%) followed by onion bulb extract @ 10% (57.58%) and neem leaf extract @ 10% (48.13%). The plant extracts, potential bio-agent and fungicide found effective in vitro were tested and the effect of selected treatment on southern leaf blight disease intensity under field conditions was assessed during Rabi season 2018-2019. Among all the treatments, the maximum yield of maize was recorded in Mancozeb @ 0.2% (41.66q/ha) followed by Trichoderma viride (39.16 q/ha), Lemon grass oil @0.2% (37.98 q/ha), T5- Neem oil @ 0.1% (34.33 q/ha), Lantana camara @15% (32.42 q/ha), Neem leaf extract @10%(30.83 q/ha), and Onion bulb @ 10 % (30.50 q/ha) as compared to the untreated control(25.00 q/ha).

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