A multi-environmental field study was conducted in 2017 and 2018 in Nebraska to investigate potential interactions between soybean seedling diseases and soil-applied residual pre-emergence (PRE) herbicides. Experiments were established from mid-May to early June in fine-textured, poorly drained soils with a history of seedling establishment problems. PRE herbicides consisted of chlorimuron-ethyl, flumioxazin, metribuzin, saflufenacil, and sulfentrazone applied at labeled rates, in addition to non-treated control. Assessments included soybean injury, seedling root lesion severity (DSI), plant height, population, biomass, and yield. Additionally, symptomatic seedling roots were sampled for fungal and oomycete organisms to expand comprehension of potential biotic associations. Greater soybean injury and reduced root biomass were observed in two distinctive environments following PPO-inhibiting PRE herbicide applications. Exceptionally in one environment, where DSI seemed (P = 0.07) lower for metribuzin in comparison to saflufenacil, PRE herbicides did not affect seedling root rot severity and no yield differences occurred among treatments. Community composition depicting Fusarium, Phytophthora, Pythium, and Rhizoctonia genera varied considerably across environments (P < 0.001) and DSI classes (P = 0.002), representing distinctive ecological environments under investigation. Phytophthora structured a large portion (>40%) of the total primary pathogenic isolates recovered in the highest DSI environment, whereas Pythium frequency ranged from 4.6% to 22% across all surveyed environments, and Rhizoctonia recovery was low (<10.3%) and sporadic. Across environments with varying DSI and soilborne pathogen composition, results indicated a lack of consistent interaction between soil-applied residual PRE herbicides and the incidence of soybean seedling diseases in optimal to delayed planting situations.

2017 年和 2018 年在内布拉斯加州进行了一项多环境实地研究，以调查大豆幼苗病害与土壤施用的残留芽前 (PRE) 除草剂之间的潜在相互作用。试验于 5 月中旬至 6 月初在质地细腻、排水不良、存在育苗问题的土壤中进行。除了未处理的对照外，PRE 除草剂包括以标示用量施用的氯嘧磺隆、氟嘧啶、灭螨灵、苯嘧磺草胺和磺草胺。评估包括大豆损伤、幼苗根部损伤严重程度 (DSI)、株高、种群、生物量和产量。此外，对有症状的幼苗根部进行真菌和卵菌取样生物体，以扩大对潜在生物关联的理解。在 PPO 抑制 PRE 除草剂应用后，在两种不同的环境中观察到更大的大豆损伤和减少的根生物量。特别是在一个环境中，与苯嘧磺草胺相比，metribuzin 的 DSI 似乎 ( P  = 0.07) 较低，PRE 除草剂不影响幼苗根腐病的严重程度，并且处理之间没有出现产量差异。描述镰刀菌属、疫霉属、腐霉属和丝核菌属的群落组成在不同环境（ P  < 0.001）和 DSI 类（ P = 0.002），代表被调查的独特生态环境。在最高 DSI 环境中回收的主要病原分离株中，疫霉占了很大一部分（>40%），而在所有调查的环境中，腐霉的频率范围为 4.6% 至 22%，丝核菌的回收率较低（<10.3%）且零星. 在具有不同 DSI 和土壤传播病原体组成的环境中，结果表明土壤施用的残留 PRE 除草剂与大豆幼苗病害发生率之间缺乏一致的相互作用，在最佳到延迟种植的情况下。