The effectiveness of extracts against Alternaria solani depends on use at the higher concentrations and various solvents. A higher rate of mycelial reduction was recorded by ethanol extracts of Allium sativum at all concentrations (100%) followed by methanol extracts of Allium sativum at 25%, 50%, 100% concentration (90.02%, 97.01%, 100% respectively). Result: Results showed that most of the methanolic extract plants were showed significant inhibition of the mycelial growth as compared to ethanolic and petroleum ether extracts. Evaluation of plant extracts was carried out against Alternaria solani using food poisoned technique on PDA. The Alternaria solani was isolated from infected tomato leaves showing early blight symptoms. Thus, crude extracts were extracted from medicinal plants with different solvents (methanol, ethanol and petroleum at (25%, 50% and 100%) concentrations. Methods: In vitro experiment was conducted to evaluate the effectiveness of crude extracts of 16 selected medicinal plants against Alternaria solani. There is a research need to identify effective botanical extracts to control Alternaria solani that cause early blight of tomato and for evaluation of plant extracts through different solvents on the target pathogen. In Ethiopia, control of early blight is largely dependent on fungicidal application. Background: Tomato (Lycopersicon esculentum Mill.) belongs to the family Solanaceae.
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