Spring dead spot (SDS) (Ophiosphaerella spp.) causes damage to hybrid bermudagrass (Cynodon dactylon (L.) Pers. x transvaalensis Burtt Davy) grown in areas where winter dormancy occurs. The pathogen infects the stolons, rhizomes, and roots of warm-season grasses. Symptoms appear as circular, necrotic patches at spring greenup that reduce the playability and aesthetics of bermudagrass. Historically, fungicide efficacy against SDS has been inconsistent. There may be opportunities to improve application and post-application practices to mitigate the inconsistency. A study was conducted from 2019 to 2021 to examine the influence of post-application irrigation and soil surfactant on tebuconazole efficacy against SDS. The study was conducted at three locations: Virginia Tech Turfgrass Research Center (TRC), Blacksburg, VA; Independence Golf Club (IGC), Midlothian, VA; Nutters Crossing Golf Club (NCGC), Salisbury, MD. Tebuconazole was applied in the fall either once at 1.5 kg ai ha⁻¹ or twice at 1.5 kg ai ha⁻¹ two to four weeks apart when soil temperatures were between 10.7 and 21.8 °C. Treatments were applied with or without a soil surfactant and with or without 0.6 cm of post-application irrigation. Bermudagrass was assessed the following spring two or three times for patch number and percent SDS. Data were analyzed by assessment date, subjected to analysis of variance, and means were separated using Tukey's Honest Significant Difference test (P = 0.05). There were no treatment differences at IGC or NCGC in 2020 or 2021. At the TRC in both 2020 and 2021, results were inconsistent with tebuconazole generally suppressing SDS compared to the nontreated control. However, differences between tebuconazole-treated plots were variable. Our study suggests that including a soil surfactant with tebuconazole applications and/or irrigating post-application does not consistently increase SDS suppression.

春季死斑 (SDS) ( Ophiosphaerella spp.) 对生长在冬季休眠地区的杂交狗牙根 ( Cynodon dactylon (L.) Pers. x transvaalensis Burtt Davy)造成损害。病原体感染暖季草的匍匐茎、根茎和根。症状在春季绿化时表现为圆形坏死斑块，降低了狗牙根的可玩性和美观性。从历史上看，杀菌剂对 SDS 的功效一直不一致。可能有机会改进应用程序和应用程序后的做法以减轻不一致。从 2019 年到 2021 年进行了一项研究，以检查施用后灌溉和土壤表面活性剂对戊唑醇对 SDS 的疗效。该研究在三个地点进行：弗吉尼亚理工大学草坪研究中心 (TRC)，弗吉尼亚州布莱克斯堡；独立高尔夫俱乐部（IGC），弗吉尼亚州米德洛锡安；Nutters Crossing 高尔夫俱乐部 (NCGC)，马里兰州索尔兹伯里。戊唑醇在秋季以 1.5 kg ai ha -1 施用一次^{或以 1.5 kg ai ha -1}施用两次当土壤温度在 10.7 到 21.8 °C 之间时，相隔两到四个星期。使用或不使用土壤表面活性剂以及使用或不使用 0.6 cm 的施用后灌溉进行处理。在接下来的春天，百慕大草被评估了两到三次补丁数和百分比 SDS。数据按评估日期进行分析，进行方差分析，并使用Tukey's Honest显着差异检验分离平均值（P = 0.05）。2020 年或 2021 年 IGC 或 NCGC 的治疗没有差异。在 2020 年和 2021 年的 TRC 中，与未治疗的对照组相比，戊唑醇通常抑制 SDS 的结果不一致。然而，戊唑醇处理的地块之间的差异是可变的。