Spot form of net blotch (SFNB), caused by Pyrenophora teres f. maculata is a prevalent and damaging foliar disease of barley (Hordeum vulgare). Fungicides are commonly used to manage SFNB infection and reduce production loss in susceptible varieties. This study determined the efficacy of suppression of SFNB and associated grain yield and quality improvements from application of fungicides to seed, fertiliser and/or foliar treatments. Eight field experiments were conducted in south-eastern Australia during 2016–2018. Two experiments compared single applications of different commercially available seed, fertiliser and foliar fungicides. Six experiments evaluated different growth stage application timings of either a single application or combinations of seed applied fluxapyroxad and foliar applied prothioconazole + tebuconazole. Spot form of net blotch caused grain yield loss of up to 1.2 t/ha (20%), reduced grain retention (percentage seed width greater than 2.5 mm) and weight by up to 15% and 13%, respectively, and increased screenings (percentage seed width less than 2.2 mm) by up to 18%. Seed applied fluxapyroxad was the most effective fungicide treatment providing the greatest SFNB suppression, grain yield and quality increase of the single fungicide applications. The combination of seed applied fluxapyroxad with a foliar application of prothioconazole + tebuconazole at flag leaf emergence significantly increased grain yield and quality further in one experiment. The dual foliar fungicide application of prothioconazole + tebuconazole at stem elongation (Z31) and flag leaf emergence (Z39) was not as effective in providing SFNB suppression according to AUDPC but provided comparable grain yield and quality to the seed and foliar treatment. Of the foliar fungicides, prothioconazole + tebuconazole and bixafen + prothioconazole provided the best SFNB suppression, grain yield and quality. These fungicide applications strategies provide improved SFNB management options for barley growers, particularly in high yielding crops where grain yield exceeds 5 t/ha.

斑点形式的网斑病 (SFNB)，由Pyrenophora teres f引起。黄斑病是大麦（Hordeum vulgare）。杀菌剂通常用于控制 SFNB 感染并减少易感品种的生产损失。该研究确定了抑制 SFNB 的功效以及从杀菌剂到种子、肥料和/或叶面处理的相关谷物产量和质量改进。2016-2018 年在澳大利亚东南部进行了八次现场试验。两个实验比较了不同的市售种子、肥料和叶面杀菌剂的单次施用。六个实验评估了单次施用或种子施用fluxapyroxad和叶面施用丙硫菌唑+戊唑醇的组合的不同生长阶段施用时间。斑点形式的网斑导致谷物产量损失高达 1.2 吨/公顷 (20%)，降低了谷物保留率（种子宽度百分比大于 2. 5 毫米）和重量分别增加了 15% 和 13%，并且增加了筛选（百分比种子宽度小于 2.2 毫米）高达 18%。种子施用的fluxapyroxad是最有效的杀真菌剂处理，提供最大的SFNB抑制、单一杀真菌剂施用的谷物产量和质量提高。在一项实验中，在旗叶出现时将种子施用fluxapyroxad与叶面施用丙硫菌唑+戊唑醇相结合，进一步显着提高了谷物产量和质量。根据 AUDPC，在茎伸长 (Z31) 和旗叶出现 (Z39) 时使用丙硫菌唑 + 戊唑醇双重叶面杀菌剂在抑制 SFNB 方面效果不佳，但提供了与种子和叶面处理相当的谷物产量和质量。在叶面杀菌剂中，丙硫菌唑 + 戊唑醇和联苯吡菌胺 + 丙硫菌唑提供了最佳的 SFNB 抑制、谷物产量和质量。这些杀菌剂应用策略为大麦种植者提供了改进的 SFNB 管理选择，特别是在谷物产量超过 5 吨/公顷的高产作物中。