In vitro antibacterial activity of some plant essential oils against Pseudomonas syringae pv. Syringae and Rathayibacter tritici

Plants extracts can be a new sources for pest and disease controlling. In this research, the antibacterial effects of essential oil from 9 plants including, Juncus, Euonymus japonicas, Taxus baccata, Dana racemose, Datura stramonium, Lythrum Salicaria, Cupressus sempervirens, Ilex aquifolium and Hyssopus officinalis with different concentrations, means 12.5, 25, 50 and 100 % used for three bacteria such as E.coli, Pseudomonas syringae. pv syringae, Rathayibacter tritici through in the form of disc diffusion. The experimental was as completely randomized factorial design with three replications. At the end, qualitative and quantitative analysis of the components of the essential oil were analyzed by GC-MS. The results of variance analysis of the inhibitory effects in different concentrations showed that, plant species, the different concentrations of essential oil, the type of bacteria and mutual interaction have shown the significantly meaning, in terms of inhibitory effects (P <0.01). The results indicated, the most antimicrobial activities related to the Juncus essential oil with the zone of 13.3 mm for E.coli. The part of Juncus essential oil so examined by GC-MS system and the result has shown 14 different compounds. The maximum and minimum substances were Menthol (41%), Menthone (12%) and Pulegone (8.62%), respectively. From this research, we conducted that the juncus.s essential oil putatively can be as a source of disease control agent.