Microdochium patch is a turfgrass disease caused by the fungal pathogen Microdochium nivale (Fr.) Samuels and I.C. Hallett that occurs in climates similar to the cool, humid regions of North America's Pacific Northwest. Mineral oil, S, and phosphorous acid (H₃PO₃) have been shown to suppress Microdochium patch on annual bluegrass (Poa annua L.) putting greens in western Oregon. Previous research using rates of 19.9 kg mineral oil ha^–1 applied every 2 wk alone or as a tank mixture with 12.2 kg S ha^–1, 3.7 kg H₃PO₃ ha^–1, or both resulted in unacceptable turfgrass thinning. The objective of this field experiment was to evaluate whether tank mixes of these products would suppress Microdochium patch and yield acceptable turfgrass quality when rates of mineral oil were reduced from 19.9 to 10.0 kg ha^–1, S from 12.2 to 6.1 kg ha^–1, or H₃PO₃ from 3.7 to 1.8 kg ha^–1. In both years of the experiment, all treatments suppressed Microdochium patch to <2% disease compared to more than 40% disease in the non-treated control. Mineral oil applied with S resulted in a larger loss of green cover compared to mineral oil applied with H₃PO₃ regardless of rate. These results suggest that tank mixing mineral oil and S should be avoided in the winter months. Further research studying the mitigation of green cover loss associated with these treatments is warranted.

中文翻译：

---

比较矿物油、硫磺和亚磷酸对 Microdochium 斑块抑制和草坪质量的影响

Microdochium patch 是一种草坪病，由真菌病原体Microdochium nivale (Fr.) Samuels 和 IC Hallett 引起，发生在类似于北美太平洋西北部凉爽潮湿地区的气候中。矿物油、S 和亚磷酸 (H ₃ PO ₃ ) 已被证明可以抑制俄勒冈州西部一年生早熟禾 ( Poa annua L.) 果岭上的 Microdochium 斑块。之前的研究使用 19.9 kg 矿物油 ha ^{–1 的}比率，每 2 周单独施用一次，或与 12.2 kg S ha ^–1、3.7 kg H ₃ PO ₃  ha ^{–1 混合使用}，或两者都导致不可接受的草坪变薄。该田间试验的目的是评估当矿物油的用量从 19.9 千克 ha ^–1降低到 10.0 kg ha ^–1，硫从 12.2千克 ha ^–1降低到 6.1 kg ha ^{–1 时}，这些产品的桶混是否会抑制 Microdochium 斑块并产生可接受的草坪草质量，或 H ₃ PO ₃从 3.7 到 1.8 kg ha ^–1。在实验的两年中，与未治疗对照中超过 40% 的疾病相比，所有治疗都将 Microdochium 斑块抑制到 <2% 的疾病。与使用 H ₃ PO _{3 的}矿物油相比，使用 S 的矿物油导致绿色覆盖层的损失更大无论费率如何。这些结果表明在冬季应避免在罐中混合矿物油和 S。需要进一步研究减轻与这些处理相关的绿化覆盖损失。