**4. Conclusion**

The presence of *Rs* bacterium was proven to be negative in tuber from abroad. Nevertheless, the presence of the causative agent of bacterial wilt in potatoes of national consumption was detected that some producers could use tuber. The presence of *R. solanacearum* was verified through the use of specific culture media called SMSA and TZC under controlled conditions, PPO test, and pathogenicity tests. It is concluded that separate screening tests should not be used as a single detection method. *R. solanacearum* was found to be positive in the tubercle of consumption, in the different vegetative stages (seedling, leaf developed, and fruit tuber) in which samples were taken for detection of bacterial disease; these were negative in all cases, being corroborated under the same detection techniques implemented. However, since the presence of *Rs* in consumption tubers is positive, it represents a risk of a possible manifestation of the disease; it is necessary that the producing areas carry out activities to prevent the disease from developing, such as certified tuber verification, cleaning, and disinfection of machinery, among others, and, even more, to test on imported potatoes to prevent the entry of tubercontaining bacteria.

According to the essential oils of oregano and thyme, they showed inhibitory effects on the growth of the bacterium *R. solanacearum* at the 1:1 dilution result (P < 0.05) to be more effective than the rest of the dilutions evaluated, and the most effective applied amount was 15 μl of oregano and thyme essential oil.

The essential oils of oregano and thyme showed (P < 0.05) better inhibitory effect than the antibiotics used streptomycin (10 μg) and ampicillin. Therefore, essential oils are excellent alternatives to antibiotics in the control of the bacterium *R. solanacearum.* However, it is very important to consider others studies to evaluate the phytotoxic activity of essential oils studied in this research (*L. graveolens* and *T. vulgaris*) on *Rs* in different phenological stages of potato crop under production system.
