International Journal of Pure & Applied Bioscience (IJPAB)
Year : 2015, Volume : 3, Issue : 5
First page : (143) Last page : (151)
Article doi: http://dx.doi.org/10.18782/2320-7051.2136
Role of Essential Oils in Controlling Fungi that Cause Decline Disease of Guava
Younis K. Hamad1,2*; Magda M. Fahmi1; Fathallah M. Zaitoun1 and Sabreen M. Ziyada1
1Plant Pathology Dept., Faculty of Agriculture, Alexandria University, Alexandria, Egypt
2Plant Protection Dept., College of Food and Agriculture Sciences, King Saud University, Saudi Arabia
*Corresponding Author E-mail: yhamad@ksu.edu.sa
Abstract
The effect of 11 essential oils was in-vitro and in-vivo evaluated against guava decline disease fungi namely, Botryodiplodia theobromae, Fusarium oxysporum and Rhizoctonia solani isolated from guava shoots, roots and rhizosphere. Six concentrations of each were studied in vitroon potato dextrose agar. Using of clove oil and judean wormwood oil separately at 250 ppm, pepper and tangerine oils at 500 ppm, anise oil at 750 ppm and onion oil at 1000 ppm led to full inhibition of radial growth of B. theobromae. In the case of F. oxysporum, full inhibition of radial growth was occurred by clove oil at 500 ppm or judean wormwood, onion and cinnamon oils at 750 ppm as well as tangerine, anise, black seed and thyme at 1000 ppm. The growth of R. solani has been full inhibited using clove, and judean wormwood oils at 250 ppm or onion oil at 500 ppm. While, other tested oils have inhibitory effects at concentrations higher than previously mentioned.In vivo study showed that, the effect of the treatment of 1.5 years old guava seedlings roots with clove and judean wormwood oils separately using three concentrations (500,1000 and 1500 ppm) for 20 minutes before planting in contaminated soil withdecline fungi led to significant differences between treatments and the only contaminated ones (control). The best result were obtained using clove oil at 1500 ppm which inhibited completely the infection (severity =0) and gave significant increase in plant height and dry weight of both shoot and root systems as well as leave contents of chlorophyll a and chlorophyll b.
Key words:Essential oils, Guava decline disease, Plant pigments.
Full Text : PDF; Journal doi : http://dx.doi.org/10.18782
Cite this article: Hamad, Y.K., Fahmi, M.M., Zaitoun, F.M. and Ziyada, S.M., Role of Essential Oils in Controlling Fungi that Cause Decline Disease of Guava, Int. J. Pure App. Biosci. 3 (5): 143-151 (2015). http://dx.doi.org/10.18782/2320-7051.2136
