Abstract
This study was carried out to study the in-vitroefficacy of different botanical extracts against leaf spot of marigold, caused by Alternaria alternata. The results of present study showed that the disease incidence from variouslocations of district HyderabadSindhwas observed Ghangra Mori35%, TandoHyder 30%, Rahooki25%, Moosa Khatyan20%, and Hosri15%.Upper limitdisease occurrencewas observedfrom Ghangra Mori and lower limit sickness was recordedfrom Hosri. The botanicalplantextract ‘Neem’ observed 48, 40and 34mmlinear colony growth of Alternaria alternataat 2%, 4% and 6% concentrations, respectively, Dhaturaextract observed 75.5, 63 and 57.5mmcolony growth of Alternaria alternataat 2%, 4% and 6% concentrations, respectively. Garlic extract observed 49%, 43% and 36% linear colony growth of Alternaria alternataat 2%, 4% and 6% concentrations, respectively. Ginger extract observed 50, 43.5and 36.5mmcolony growth of Alternaria alternataat 2%, 4% and 6% concentrations, respectively. Minimum linear colony growth of Alternaria alternatawas observed at 6% concentration for Neem extract followed by Garlic extract, Ginger extract and Datura extract, respectivelythe plant infusion, Neeminfusion show good effectoppositelinear colony growth of Alternaria alternataon6% solution
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