Cytospora plurivora, in western Colorado, is a limiting factor to peach production. The pathogen requires a wound, and entry points can be ubiquitous on peach trees depending on the season because of the need for tree cultural management (eg. dormant and/or summer pruning) and annual winter damage. Our study is focused on preventive control of the pathogen through wound protection. Fungicides and sealants were either evaluated in vitro, for antifungal activity, or selected from the present and previous trials to be evaluated in the field. Ten fungicide/sealant combinations were evaluated in the field for pathogen control during spring of 2018 and 2019 in western Colorado. Treatments included combinations of thiophanate-methyl, lime sulfur, VitiSeal (alone and in combination with other chemicals), with sealants (latex paint, paraffinic oil, and Nu-film 17). The fungicides/sealants that were most effective in reducing C. plurivora pathogen viability in branches and canker sizes was thiophanate-methyl alone, combined with VitiSeal, and combined with latex paint at 50 and 70% and VitiSeal combined with lime sulfur. The sealants Nu-film 17 and paraffinic oil, when combined with lime sulfur, were ineffective in all trials. Further, fungicides which showed evidence of efficacy in these studies and in previous studies were analyzed for their half maximum effective concentration rates (EC₅₀) for an understanding of pathogen dose sensitivity.

科罗拉多州西部的Cytospora plurivora是限制桃子生产的因素。病原体需要伤口，并且由于季节的需要，需要对树木进行文化管理（例如休眠和/或夏季修剪）和每年的冬季破坏，桃树上的进入点可能随季节而变。我们的研究集中在通过伤口保护对病原体的预防控制上。杀菌剂和密封剂均经过体外评估，是否具有抗真菌活性，或从目前和以前的试验中选择要在现场进行评估的试验。在2018年春季和2019年春季期间，在科罗拉多州西部评估了10种杀菌剂/密封剂组合用于病原体控制。处理方法包括将甲基硫氰酸甲酯，石灰硫，VitiSeal（单独或与其他化学品组合）与密封剂（乳胶漆，石蜡油和Nu-film 17）组合使用。最有效的减少百日咳衣藻的杀菌剂/密封剂病原菌在分支机构和溃疡病中的生存力是单独使用甲基硫氰酸酯，与VitiSeal结合使用，与乳胶漆（分别为50％和70％）结合使用，VitiSeal与石灰硫结合使用。密封剂Nu-film 17和石蜡油与石灰硫混合使用时，在所有试验中均无效。此外，对在这些研究和以前的研究中显示功效证据的杀菌剂，分析了其最大有效浓度的一半（EC ₅₀），以了解病原体的剂量敏感性。