Essential oils (EOs) are plant natural products typically composed of a complex mixture of molecules, many of them recognized for their antibacterial potential. EOs have different benefits in contrast to synthetic agrochemicals, like no persistence on the environment, compatibility with classical biocontrol agents and natural enemies, and no toxicity for most non-target organisms. The aim of this work was to evaluate the antibacterial effect of lemon (Citrus limon) and orange (Citrus sinensis) EOs and their combinations with mint (Mentha x piperita) or oregano (Origanum vulgare) EOs against Streptomyces scabiei, the main causal agent of the potato common scab. The EOs were characterized by GC-MS. The antibacterial activity of citrus EOs and combinations were evaluated using the broth microdilution method and the effect of the EOs on the S. scabiei envelope was analyzed by scanning electron microscopy. The lowest EO antibacterial concentrations were obtained for the combination of lemon and mint EOs, mixed in equal quantities. The application of this combination of lemon EO on S. scabiei cultures caused cell envelope damage, causing changes in the superficial hyphae anatomy and narrowing their thickness. Additionally, orange EO efficacy was enhanced in combination with oregano EO, suggesting that this binary mixture could improve their utilization as bactericidal agents against S. scabiei. These results position citrus EOs and some of their combinations as promising sustainable alternatives for potato common scab control.

精油 (EO) 是植物天然产物，通常由复杂的分子混合物组成，其中许多分子因其抗菌潜力而闻名。与合成农用化学品相比，环氧乙烷具有不同的优点，例如对环境没有持久性，与经典生物防治剂和天敌相容，并且对大多数非目标生物体没有毒性。这项工作的目的是评估柠檬（Citrus limon）和橙子（Citrus sinensis）EOs及其与薄荷（Mentha x Piperita）或牛至（Origanum vulgare）EOs的组合对疥疮链霉菌（ Streptomyces scabiei）的抗菌作用，链霉菌是链霉菌（Streptomyces scabiei）的主要致病菌。马铃薯普通疮痂病。EO 通过 GC-MS 进行表征。使用肉汤微量稀释法评估柑橘 EO 及其组合的抗菌活性，并通过扫描电子显微镜分析EO 对疥疮痂病菌包膜的影响。等量混合的柠檬和薄荷 EO 组合获得了最低的 EO 抗菌浓度。在S. scabiei培养物上应用这种柠檬 EO 组合会导致细胞包膜损伤，导致浅表菌丝解剖结构发生变化并缩小其厚度。此外，橙色 EO 与牛至 EO 结合使用的功效得到增强，表明这种二元混合物可以提高其作为针对疥癣菌的杀菌剂的利用率。这些结果将柑橘 EO 及其一些组合视为马铃薯赤霉病防治的有前途的可持续替代品。