Salvadora Persica is a plant known for its medicinal properties whose variety of pharmacological activities have been reported by many studies. Volatile extracts of Salvadora persica are obtained either by hydrodistilation or by using a Soxhlet apparatus from crushed roots by using hexane as solvent. The obtained result by hexane extraction 2.5% has given better results than the one got by steam distillation 0.05%. Thus, the extracts obtained have been analyzed by coupling (GC-MS). The following products are among the many products identified: The Eugenol, the Asarone the Borneol the Carvacrol, vanillin, the Cuminal, Camphor, Acetamide the n-benzyl, the benzyl Isocianate and the oily acids Oleic and palmitic that represents the majority of the products extracted.
The essential oil of action Persica - on Streptococcus faecalis, Escherichia coli, Staphylococcus aureus and Pseudomonas aeruginosa by the method aromatogram- shows that these bacteria are inhibited. Therefore, essential oil Miswak generated a zone of inhibition of 40, 25 and 15mm respectively on Streptococcus faecalis, Escherichia coli and Staphylococcus aureus. Meanwhile, it did not influence Pseudomonas aeruginosa.
The antimicrobial activity of the essential oils has been evaluated by determining the minimum inhibitory concentration (MIC). Comparing the antibacterial effect with antibiotics, it was observed that the Miswak has a noticeable antibacterial power. It may, then, be an excellent oral hygiene agent.

In this study, the behavior of Xanthomonas fragariae, angular leaf spot of strawberry agent, was followed in the AB medium, enriched with nitrogen, phosphorus or with potassium, and in the soil of the Mamora forest with 14% to 28% of humidity in function of these fertilizer elements. The obtained results have shown that Na2HPO4 and NH4Cl, used, 0.01 and 0.05 mol/L, respectively as a phosphorus and nitrogen source, have a significant effect on the survival of Xanthomonas fragariae. By contrast, KCl, used as a source of Potassium, has no significant effect on the number of culturable cells.
The three sources used NPK, 14% and 28% showed a great influence on the number of culturable cells of Xanthomonas fragariae, either increasing or decreasing. Potassium, at 28 to 14% of humidity, inhibited the rate growth of Xanthomonas, while the phosphorus and nitrogen stimulated its growth, greater than 28% of humidity than 14%. Similarly the bacterial growth was not affected during the incorporation of NPK at different concentrations in the soil of Mamora.

There is a growing interest in agriculture to replace synthetic chemicals with natural plant products that may have a bactericidal action. we have chosen two plant species to test their antibacterial effect against Xanthomonas fragariae Dw on tomato plants of the variety campbell 33, inoculated with this strain and two extracts pretreated with different concentrations (1%, 3% and 5%) are prepared from the leaves and stems of each species. We tested the one hand, the effect of these extracts on the removal or reduction of Xanthomonas fragariae Dw to the surface of the seeds, and secondly, their effects on growth parameters inoculated tomato plants. The effect of treatment of tomato seeds by the three concentrations of aqueous extracts of Rosmarinus officinalis L has given us a significant reduction compared to treatment with the extracts of Chenopodium ambrosioides L. Analysis of variance at the 5% threshold showed that six treatment plant extracts induced significant responses with degrees variants on vegetative and root biomass as well as the axial growth.