Streptomyces rapamycinicus HCD1–10: An effective biocontrol actinomycetes against postharvest Chinese flat peach brown rot caused by Monilinia fructicola.

• Streptomyces rapamycinicus HCD1–10 effectively combats Monilinia fructicola infection. • HCD1–10 disrupts Monilinia fructicola mycelium and releases cellular contents. • HCD1–10 triggers the auxin signaling pathway to suppress peach brown rot. Monilinia spp. causing brown rot are fungal pathogens producing severe losses in worldwide stone fruit production, with high economic relevance (M€ 1.7/year). There are three main fungal species: Monilinia laxa, M. fructigena and M. fructicola. The pathogen infects aerial parts of host plants with a variety of symptoms, including blighting of blossoms, cankers on woody tissues and rotting of fruits, although the prevalent fruit losses are in the postharvest phase. Fungicide sprays in pre- and postharvest periods are usually used to control Monilinia spp. but, in Europe, no fungicide fruit treatments are allowed after harvest. Many studies conducted in recent years have defined three main research fields within the alternative methods for postharvest brown rot control: (1) biological control sensu strictum with microbial antagonists; (2) use of natural bioactive compounds; and (3) use of physicochemical methods. Although the reviewed results have reported a significant reduction of pesticide use, a multidisciplinary approach is recommended in the future, where biological products will be combined with low-risk chemical fungicides, natural antimicrobial substances and other physical means for an integrated strategy to control brown rot. [ABSTRACT FROM AUTHOR]