Combinations of rolling, mineral oil, sulfur, and phosphorous acid affect Microdochium patch severity

Mattox, Clint; Kowalewski, Alec; McDonald, Brian; Lambrinos, John G.; Pscheidt, Jay William

doi:10.1002/agj2.20191

Cited by 11 publications

(27 citation statements)

References 30 publications

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“…19.9 kg MO ha −1 + 3.7 kg H 3 PO 3 ha A previous study demonstrated that applications of 19.9 kg of mineral oil ha −1 either alone or in a tank mix with 3.7 kg H 3 PO 3 ha −1 and/or with 12.2 kg S ha −1 every 2 wk suppressed Microdochium patch compared to a non-treated control, although severe turfgrass thinning was observed (Mattox et al, 2020). Other research in Scandinavia found the use of 19.9 or 39.8 kg ha −1 of mineral oil applied as a tank mix with 3 kg H 3 PO 3 ha −1 every 3 wk resulted in a 94 and 98% Microdochium patch suppression compared to a non-treated control, respectively (Aamlid et al, 2018).…”

Section: Discussionmentioning

confidence: 96%

Comparing rates of mineral oil, sulfur, and phosphorous acid on Microdochium patch suppression and turfgrass quality

et al. 2021

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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 (H 3 PO 3 ) 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 H 3 PO 3 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 H 3 PO 3 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 H 3 PO 3 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.Abbreviations: AUDPC, area under disease progress curve.This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

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Section: Discussionmentioning

confidence: 96%

Comparing rates of mineral oil, sulfur, and phosphorous acid on Microdochium patch suppression and turfgrass quality

et al. 2021

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“…shown excellent suppression of Microdochium patch following repeated preventative applications of phosphite products (Dempsey et al, 2018;Mattox, Kowalewski, McDonald, Lambrinos, et al, 2020). Phosphite products have also demonstrated various levels of efficacy against other turfgrass diseases such as Pythium blight (Pythium aphanidermatum) and anthracnose (Colletotrichum cereale), but not typically to commercially acceptable levels without support from traditional fungicides (Burpee, 2005;Cook et al, 2009).…”

Section: Core Ideasmentioning

confidence: 99%

Iron sulfate and phosphite products fail to suppress snow mold on amenity turfgrass in Wisconsin

Koch

2021

Crop Forage & Turfgrass Mgmt

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Snow molds are an important group of diseases of amenity turfgrass in temperate climates. Acceptable control is typically achieved through one or two fungicide applications prior to snow cover, though there is increasing interest in exploring alternative control products such as iron sulfate and/or potassium phosphite. Previous research has demonstrated that poor snow mold control is achieved when these alternative products are applied once prior to snow cover, so the objective of this study was to assess their efficacy when applied repeatedly throughout the fall. Iron sulfate heptahydrate, potassium phosphite, and the fungicide propiconazole were applied six times, every 2 weeks, throughout the fall of 2019 at three locations in Wisconsin that typically produce high, medium, and low snow mold pressure. No reduction in disease relative to the nontreated control was observed at any location in response to the iron sulfate and potassium phosphite treatments. Propiconazole did provide effective snow mold control at the low and moderate pressure locations but not at the high pressure location. Both iron sulfate and potassium phosphite have shown efficacy against select turfgrass diseases, but do not appear to provide control of snow mold in areas where snow cover persists during winter. INTRODUCTIONSnow molds such as Microdochium patch (caused by Microdochium nivale), gray snow mold (Typhula incarnata), and speckled snow mold (Typhula ishikariensis) are the primary low-temperature diseases of amenity turfgrass around the world (Hsiang et al., 1999;Mann & Newell, 2005). Microdochium patch, also known as pink snow mold, is defined by roughly circular patches of tan-or reddish-colored turf 2-8 inches (5-20 cm) in diameter. Symptoms are typically most severe under prolonged snow cover but can also occur in the absence of snow following periods of cool (32-48 ˚F) and wet weather. The presence of a pink-colored ring Abbreviation: HDD, heating degree day.This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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“…pressed Microdochium patch although unacceptable turfgrass thinning occurred (Mattox et al, 2020). This manuscript focuses on two different field experiments that quantify Microdochium patch suppression and turfgrass quality.…”

Section: Core Ideasmentioning

confidence: 99%

“…Alternatives to traditional fungicides that have been shown to suppress Microdochium patch include mineral oil on creeping bentgrass ( Agrostis stolonifera L.) (Cortes‐Barco et al., 2010a), S on colonial bentgrass ( A. capillaris L.) (Brauen et al., 1975), and phosphorous acid (H 3 PO 3 ) on both annual bluegrass and velvet bentgrass ( A. canina L.) (Dempsey et al., 2012). A tank mixture of S and H 3 PO 3 has been shown to suppress Microdochium patch more than when either S or H 3 PO 3 were applied alone (Mattox et al., 2020). A few mineral oils and S products are registered for organic agriculture (OMRI, 2020) and these may be permitted in some places where traditional fungicides are not allowed (South Portland, 2020).…”

Section: Introductionmentioning

confidence: 99%

“…The only published research to date focused on using a tank mixture of mineral oil with H 3 PO 3 to suppress Microdochium patch in the absence of snow cover took place in Scandinavia (Aamlid et al., 2018) and western Oregon (Mattox et al., 2020). Therefore, limited information is available regarding the efficacy of different application intervals.…”

Section: Introductionmentioning

confidence: 99%

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Suppression of Microdochium patch using rotations of mineral oil, sulfur, and phosphorous acid

et al. 2021

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Microdochium patch is a turfgrass disease caused by the fungal pathogen Microdochium nivale (Fr.) Samuels and I.C. Hallett that occurs in cool, humid conditions, which are commonplace in the U.S. Pacific Northwest and northern Europe. Pesticide restrictions in certain areas make suppressing Microdochium patch challenging, and alternative control methods are desired. Previous research has shown that mineral oil, S, and phosphorous acid (H 3 PO 3 ) suppress Microdochium patch, but abiotic damage was associated with repeated mineral oil applications. Two field experiments in western Oregon focusing on the suppression of Microdochium patch and turfgrass quality on annual bluegrass (Poa annua L.) greens are presented. The first experiment compared tank mixtures of mineral oil and S or mineral oil and H 3 PO 3 in rotation with a tank mixture of S and H 3 PO 3 . The second experiment focused on seasonal rotations that excluded mineral oil in certain months and compared 2-and 3-wk application frequencies. All rotations, in both experiments, suppressed Microdochium patch compared to the non-treated control, although differences in turfgrass quality were observed. In the first experiment, green cover percentage was used to assess abiotic damage. A mineral oil and H 3 PO 3 tank mixture rotated every 2 wk with S and H 3 PO 3 resulted in the highest green cover percentage. In the second experiment, most of the applications made every 2 wk completely suppressed Microdochium patch. Two treatments applied every 2 wk that withheld mineral oil in the winter months resulted in turfgrass quality ratings considered acceptable for putting greens on all rating dates. INTRODUCTIONMicrodochium patch is a turfgrass disease caused by the fungal pathogen Microdochium nivale (Fr.) Samuels & I.C. Hallett (teleomorph = Monographella nivalis). This disease predominantly occurs in cool-humid areas when temperatures Abbreviations: AUDPC, area under disease progress curve.

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Combinations of rolling, mineral oil, sulfur, and phosphorous acid affect Microdochium patch severity

Cited by 11 publications

References 30 publications

Comparing rates of mineral oil, sulfur, and phosphorous acid on Microdochium patch suppression and turfgrass quality

Comparing rates of mineral oil, sulfur, and phosphorous acid on Microdochium patch suppression and turfgrass quality

Iron sulfate and phosphite products fail to suppress snow mold on amenity turfgrass in Wisconsin

Suppression of Microdochium patch using rotations of mineral oil, sulfur, and phosphorous acid

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