Antifungal Activity of Garlic (Allium sativum) Essential Oil and Wood Ash against Post-harvest Fruit Rot of Banana (Musa acuminata L.) in Yola, Adamawa State, Nigeria
S. A. Muazu *
Department of Biological Sciences, Taraba State University, Jalingo, Nigeria
F. K. Channya
Department of Plant Science, Modibbo Adama University of Technology, Yola, Nigeria
I. B. Chimbekujwo
Department of Plant Science, Modibbo Adama University of Technology, Yola, Nigeria
B. Basiri
Department of Plant Science, Modibbo Adama University of Technology, Yola, Nigeria
B. G. Zakari
Department of Biological Sciences, Federal University, Wukari, Nigeria
K. U. Tukur
Department of Biological Sciences, Taraba State University, Jalingo, Nigeria
K. M. Fauziya
Department of Biological Sciences, Taraba State University, Jalingo, Nigeria
K. B. Samuel
Department of Biological Sciences, Taraba State University, Jalingo, Nigeria
*Author to whom correspondence should be addressed.
Abstract
Studies on antifungal effect of garlic (Allium sativum) essential oil and wood ash were determined on causative agents of post-harvest fruit rot of banana. Different concentrations of essential oil of garlic (0.15, 0.50, and 1.0%) and quantities of wood ash (0.1, 0.3 and 0.5g) were used. The treatments were laid out in Completely Randomized Design (CRD) with three replications. Four (4) fungal pathogens associated with rots of banana fruits were isolated. The fungi isolated and their incidence of occurrence included Colletotrichum musae (18%), Pyricularia grisea (18%), Rhizoctonia solani (38%) and Rhizopus stolonifer(26%). Rhizoctonia solani and Rhizopus stolonifer were the most pathogenic with rot covering more than 75% of the fruit surface. All the tested concentrations (0.15, 0.5 and 1.0%) of essential oil of garlic significantly (p < 0.05) suppressed mycelial growth of the fungi in-vitro. Also all tested quantities of wood ash (0.1, 0.3 and 0.5g) significantly (p < 0.05) reduced the rots of the fungi in-vivo. The effect was proportional to the concentrations of essential oil of garlic and quantities of wood ash used and reduction was highest at 1.0% of garlic oil and 0.5g of wood ash. Both garlic (Allium sativum) essential oil and wood ash proved effective in the control of disease severity and these natural plant materials are recommended as an alternative to pesticides which are often harmful and costly.
Keywords: Antifungal activities, garlic essential oil, wood ash, Musa acuminate, Yola