Abstract Peach brown rot caused by Monilinia fructicola is one of the most economically destructive diseases of peach (Prunus persica L.) in some orchards of China. Biocontrol is a significant strategy that exhibits strong levels of control and ecologically sound concepts in disease management. The purpose of this study was to investigate the combined suppressive effects of three endophytic bacterial strains (xj-14, xj-15, and xj-16) and two soil rhizosphere bacterial strains (xj-A and xj-C) that were shown to have strong inhibitory activity toward M. fructicola in our previous study. The optimal strains and the optimized combination of strains were determined. The combination of strains xj-15 and xj-C inhibited M. fructicola more intensively for a longer period of time. Following the application of 1 × 109 CFU/mL bacterial complex to the fruits, leaves, and shoots of peach trees infected with M. fructicola, the rate of inhibition reached 73.80%, 83.33%, and 90.43%, respectively. A pot experiment using lettuce (Lactuca sativa) showed that inoculation with the bacterial complex significantly increased the growth of seedlings. In this study, some compound bacteria were more effective than those in previous study in suppressing disease and promoting growth, which have the potential to be further applied in the field.

中文翻译：

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一种细菌复合物对桃子念珠菌最佳拮抗作用的研究

摘要 桃褐腐病是我国部分果园对桃（Prunus persica L.）经济危害最大的病害之一。生物防治是一项重要的战略，在疾病管理中表现出强大的控制水平和生态学上合理的概念。本研究的目的是研究三种内生细菌菌株（xj-14、xj-15 和 xj-16）和两种土壤根际细菌菌株（xj-A 和 xj-C）的联合抑制作用在我们之前的研究中，对 M. fructicola 有很强的抑制活性。确定了最佳菌株和最佳菌株组合。菌株 xj-15 和 xj-C 的组合在更长的时间内更强烈地抑制 M. fructicola。将 1 × 109 CFU/mL 细菌复合物应用于果实后，M. fructicola 感染桃树的叶片和枝条，抑制率分别达到 73.80%、83.33% 和 90.43%。使用生菜 (Lactuca sativa) 进行的盆栽实验表明，接种细菌复合物显着促进了幼苗的生长。本研究发现一些复合菌在抑制疾病和促进生长方面比以往研究中的复合菌更有效，具有在该领域进一步应用的潜力。