IN VITRO EVALUATION OF FUNGICIDES, PLANT EXTRACTS AND OILS AGAINST ALTERNARIA ALTERNATA (FR.) KEISSLER CAUSING LEAF SPOT OF ALOE BARBADENSIS (MILLER)P.K. AMRATE, J.R. SHARMA AND CHAMANDEEP SINGH
Among all the tested fungicides, difenconazole was found to be most effective followed by tebuconazole and propiconzole as it showed EC50 value of 1.7, 3.3 5.8 μm/mL, respectively and completely inhibited the growth of the pathogen even at 25 mg/mL. However, turmeric rhizome and garlic clove extract were inhibited about 70.0 per cent growth of the pathogen at 20 per cent concentration. Garlic oil at 1000 μg/mL whereas lemon grass, ginger, palmarosa and tulsi oils at 2000 μg/m completely inhibited the mycelial growth of the pathogen. The EC50 value for garlic oil was very low 290 μg/mL.
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