Bioefficacy of some plant extracts on growth parameters and control of diseases in Lycopersicum esculentum

The present study was undertaken to determine the effect of some medicinal plants on growth parameters and diseases, like alternaria canker, blight, leafspot, fruitspot, blossom end rot and sunscald of Lycopersicum esculentum. To understand the mechanism, the phytochemical analysis of plants and its effect on bacterial and fungal cultures were investigated. The effects of selected plant extracts on tomato were observed. Ten medicinal plants were applied for the control of diseases, and its antibacterial and antifungal effect was tested against Clavibacter michigenesis, Alternaria solani, and Septoria lycopersici, Pythium debaryanumand and Phytopthora capsici that cause alternaria canker,early blight, leaf spot, fruit spot, blossom end rot and sunscald disease in Lycopersicum esculentum..Extract of Ageratum.conyzoides was efficient in inhibiting the growth of Clavibacter michigenesis while mycelial growth of Alternaria solani,Septoria lycopersici,Pythium debaryanum & Phytopthora capsici was inhibited by Tagetes patula, Piper nigrum, Aegle marmelos & Ageratum conyzoides.Among the plant extract tested in field, Ageratum.conyzoides was found most effective in reducing the Alternaria canker disease by 78.20% and Azadirachta.indica reduced the Early blight & leaf spot disease by 53.84% & 40.78%respectivilly,Aegle marmelos reduced the fruit spot disease by 61.29%.Pongamia piñata & Brassica campestris reduced the Blossom end rot disease by 86.95% and 82.17% and Ageratum.conyzoides& Pongmia piñata reduced the sunscald disease by90.08% & 76.85% respectively in Lycopersicum esculentum. The result suggests the applications are also growth promotive and cost effective and non-hazardous in agro-ecosystem.

Author(s): Mitali Madhusmita Pattnaik, Manoranjan Kar and R. K. Sahu*

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