Two fungicides, pyraclostrobin and pyraclostrobin + fluxapyroxad, were evaluated on five grain sorghum hybrids to manage foliar diseases in a three-year field study. Anthracnose (leaf phase) caused by Colletotrichum sublineola Henn. ex Sacc. and Trotter was observed each year in Arkansas, while target leaf spot caused by Bipolaris sorgicola (Lefebvre and Sherwin) Alcorn was observed in 2016. Overall disease severity at growth stage 8 (hard-dough) was severe in 2016 and 2017, but low in 2018. The fungicides were similar in efficacy to control anthracnose and target leaf spot. Grain sorghum hybrids varied in susceptibility to anthracnose with Pioneer 83P99 and Pioneer 84P80 being susceptible compared to Dyna-Gro M73GR55, Sorghum Partners 7715, and Terral REV 9782. Pioneer 84P80 and Terral REV 9782 were susceptible to target leaf spot. A greater grain yield was observed on the anthracnose-resistant hybrids when foliar disease was severe (>20%) compared to susceptible hybrids. When anthracnose was severe (>20%), yield protection by a fungicide averaged 70% on the susceptible and 7% on anthracnose-resistant hybrids. Fungicides were more frequently profitable on susceptible hybrids when anthracnose severity was >20% than on the anthracnose-resistant hybrids. At best, fungicide profitability was inconsistent on susceptible hybrids where disease pressure was low (<1%). These data provide some guidelines for fungicide use on grain sorghum that vary in susceptibility to anthracnose and target leaf spot in Arkansas and the Mid-southern United States.

在一项为期三年的田间研究中，对五种谷物高粱杂交种评估了两种杀菌剂唑菌胺酯和唑菌胺酯 +fluxapyroxad 以防治叶面病害。炭疽病（叶期）由Colletotrichum sublineola Henn引起。前萨克。和 Trotter 每年在阿肯色州都被观察到，而由Bipolaris sorgicola引起的目标叶斑病(Lefebvre 和 Sherwin) 2016 年观察到 Alcorn。2016 年和 2017 年生长阶段 8（硬面团）的总体疾病严重程度很严重，但在 2018 年较低。杀菌剂在控制炭疽病和目标叶斑病方面的功效相似。谷物高粱杂交种对炭疽病的易感性不同，与 Dyna-Gro M73GR55、Sorghum Partners 7715 和 Terral REV 9782 相比，Pioneer 83P99 和 Pioneer 84P80 易感。Pioneer 84P80 和 Terral REV 9782 易感目标叶斑病。与易感杂种相比，当叶病严重 (>20%) 时，在抗炭疽病杂种上观察到更高的谷物产量。当炭疽病严重 (>20%) 时，杀真菌剂对易感品种的产量保护平均为 70%，对炭疽病抗性杂种则为 7%。当炭疽病严重程度大于 20% 时，杀菌剂对易感杂交种的收益高于抗炭疽病杂交种。在病害压力较低（<1%）的易感杂交种上，杀菌剂的盈利能力充其量是不一致的。这些数据为在阿肯色州和美国中南部对炭疽病和目标叶斑病的易感性不同的谷物高粱上使用杀菌剂提供了一些指导。