柑橘沙皮病对广陈皮中橙皮苷含量的影响及防治药剂筛选OA

Citrus melanose,caused by Diaporthe citri,is one of the major fungal diseases threatening the Citri reticulatae Pericarpium(Guangchenpi)industry.The characteristic dark-brown lesions it induces severely compromise the commercial value of Guangchenpi.To evaluate the impact of this disease on the medicinal value of Guangchenpi and develop more efficient control measures,this paper compared hesperidin content between healthy and infected pericarps of Citrus reticulata cv.Chachiensis and assessed the in vitro toxicity of seven broad-spectrum fungicides against the pathogen.Results showed that the pathogen invades stomata to induce dark-brown lesion formation,leading to a significant 41.72%reduction in hesperidin content in infected pericarps(1.97%)compared to healthy pericarps(3.38%).Among the tested fungicides,40%fluxapyroxad·tebuconazole suspension concentrate exhibited optimal inhibitory efficacy(EC50=0.577 8 mg/L).This paper found that D.citri infection not only degrades the visual quality of Citri reticulatae Pericarpium but also suppresses flavonoid biosynthesis.The identified superior antifungal performance of 40%fluxapyroxad·tebuconazole provides a critical foundation for developing field-level disease management strategies and enhancing Guangchenpi quality.