Exploration of anti-oomycete components from wild plants against Phytophthora infestans

Introduction: severely threatens potato production, necessitating novel natural fungicide. Methods: were fractionated. The petroleum ether fraction and aqueous fraction were evaluated for effects on mycelial growth, morphology, spore germination, pathogenicity, stress response, and synergy with fungicide Infinito. Components were analyzed by LC-MS. Results: ), enhanced inhibition was observed. LC-MS tentatively identified 20 components each, primarily flavonoids and phenolics. Discussion: are potential natural anti-oomycete resources, providing a basis for the development of environmentally friendly inhibitors against late blight.