Oxathiapiprolin Alone or Mixed with Metalaxyl Seed Treatment for Management of Soybean Seedling Diseases Caused by Species of Phytophthora, Phytopythium, and Pythium

Vargas, Amilcar; Paul, Pierce A.; Winger, Jonell; Balk, Christine; Eyre, Meredith M.; Clevinger, Bruce; Noggle, Sarah; Dorrance, Anne E.

doi:10.1094/pdis-09-21-1952-re

Cited by 8 publications

(3 citation statements)

References 73 publications

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“…In the present study, oxathiapiprolin application controlled PRR resulting in significantly greater soybean yield in experiments conducted over a period of 2 years. These results are consistent with those of previous studies reporting efficacy of oxathiapiprolin for controlling soybean root rot 30,38 . Specifically, both seed treatment (0.12–0.18 g a.i.…”

Section: Discussionsupporting

confidence: 92%

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Use of oxathiapiprolin for controlling soybean root rot caused by Phytophthora sojae: efficacy and mechanism of action

Wang

et al. 2022

Pest Management Science

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Background: Oxathiapiprolin is a new isoxazoline fungicide developed by DuPont to control oomycete diseases. Although oxathiapiprolin has shown strong inhibitory activity against oomycete pathogens, little is known about its ability to control Phytophthora sojae.Results: Oxathiapiprolin showed high inhibitory activity against Phytophthora sojae, with 50% effective concentration (EC 50 ) values ranging from 1.15 × 10 −4 to 4.43 × 10 −3 ∼g mL −1 . Oxathiapiprolin inhibited various stages of Phytophthora sojae development, including mycelial growth, sporangium formation, oospore production, and zoospore release. Electron microscopy studies revealed that oxathiapiprolin caused severe morphological and ultrastructural damage to Phytophthora sojae. Oxathiapiprolin affected the cell membrane and wall of Phytophthora sojae, making it more sensitive to osmotic and cell wall stress. Oxathiapiprolin exhibited translocation activity; it was absorbed by soybean roots and then translocated to the leaves. It was effective at reducing soybean Phytophthora root rot under glasshouse and field conditions. Both fungicide seed treatment and foliar spray significantly reduced disease incidence and yield losses compared with untreated controls in the field. Conclusion:Oxathiapiprolin exhibits high inhibitory activity against Phytophthora sojae, and has multiple mechanisms of action including severe mycelial damage and modulation of osmotic and cell wall stress. These results indicate that oxathiapiprolin can be used at low concentrations for highly effective management of soybean Phytophthora root rot caused by Phytophthora sojae.

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Section: Discussionsupporting

confidence: 92%

“…These results are consistent with those of previous studies reporting efficacy of oxathiapiprolin for controlling soybean root rot. 30,38 Specifically, both seed treatment (0.12-0.18 g a.i. kg −1 seed) and leaf spray (30-40 g ha −1 ) significantly reduced PRR in repeated field experiments.…”

Section: Discussionmentioning

confidence: 99%

Use of oxathiapiprolin for controlling soybean root rot caused by Phytophthora sojae: efficacy and mechanism of action

Wang

et al. 2022

Pest Management Science

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“…on Glycine max (L.) Merr. (Vargas et al, 2022). Pyraclostrobin (FRAC Code 11), developed from derivates of natural fungicides (fungi Oudemansiella mucida and Strobilurus tenacellus and bacterium Myxococcus fulvus), is a Quinone-inhibiting fungicide (Ammermann et al, 2000), and was effective in both conditions of our experiments.…”

Section: Discussionmentioning

confidence: 77%

Comparative Performance of Fungicides, Biofungicides, Host-plant Defense Inducers, and Fertilizer in Management of Phytophthora Root Rot on Boxwood

Neupane

Baysal-Gurel

2022

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Phytophthora root rot, caused by Phytophthora nicotianae Breda de Haan, is one of the destructive diseases of boxwood (Buxus sempervirens L.) and can affect all growth stages of field- and container-grown boxwood plants. Management is a problem and is only possible through an integrated approach. In this study, the efficacy of fungicides, biofungicides, host-plant defense inducers, and fertilizer were evaluated to manage Phytophthora root rot of boxwood. The objective of this experiment was to develop fungicide and biofungicide recommendations for Phytophthora root rot management in boxwood production. Field and greenhouse experiments were conducted in 2019 (Trial 1) and 2020 (Trial 2). The field experiment was arranged in a completely randomized design with four plots per treatment with five single ‘Green Velvet’ boxwood plants per plot. The greenhouse experiment was arranged in a completely randomized design with five single ‘Green Velvet’ container-grown boxwood plants per treatment. Plots/containers were inoculated with P. nicotianae grown on rice grains. Plant growth data such as height and average width were recorded at the beginning and end of the experiments. Total plant fresh weight and root fresh weight were recorded at the end of the experiments. Roots were assessed for root rot disease severity using a scale of 0% to 100% roots affected. Treatments used in both experiments were fungicides—ametoctradin + dimethomorph, fluzapyroxad, mefenoxam, oxathiapiprolin, pyraclostrobin, pyraclostrobin + boscalid; host-plant defense inducers—aluminum tris-drench, aluminum tris-foliar, potassium salts of phosphoric acid; biofungicides—Trichoderma harzianum Rifai strain T-22 + Trichoderma virens strain G-41, Bacillus amyloliquefaciens Priest; fertilizer—water-soluble nitrogen (nitrogen 5%) and soluble potash; and combination of water-soluble nitrogen, soluble potash, and T. harzianum Rifai strain T-22 + T. virens strain G-41. All treatments were drench applied except one of the aluminum tris, which was applied as foliar. The controls were nontreated, inoculated and nontreated, and noninoculated boxwood plants. In the greenhouse experiments, treatments that effectively reduced disease severity were pyraclostrobin, ametoctradin + dimethomorph, and oxathiapiprolin. In the field experiments, treatments such as pyraclostrobin, oxathiapiprolin, mefenoxam, fluzapyroxad, and combination of water-soluble nitrogen (nitrogen 5%), soluble potash, and T. harzianum Rifai strain T-22 + T. virens strain G-41 effectively reduced Phytophthora root rot severity. Oxathiapiprolin and pyraclostrobin are the chemical fungicides that were effective in both field and greenhouse experiments.

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Effect of Infection Timing by Four Pythium spp. on Soybean Damping-Off Symptoms with and Without Cold Stress

Matthiesen

Robertson

2023

Plant Disease

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Pythium spp. cause damping-off of soybean, especially when soil conditions at or shortly after planting are cool and wet. Soybean planting dates continue to shift to earlier dates; thus, germinating seed and seedlings are exposed to periods of cold stress at a time which favors infection by Pythium and seedling disease occurs. The objective of this study was to assess infection timing and cold stress on soybean seedling disease severity caused by four Pythium spp. prevalent in Iowa, namely P. lutarium, P. oopapillum, P. sylvaticum, and P. torulosum. Each species was used individually to inoculate soybean cultivar ‘Sloan’ using a rolled towel assay. Two temperature treatments (continuous 18°C (C18); a 48 h cold stress period at 10°C (CS)) were applied. Soybean seedling age was divided into five growth stages (GS1–GS5). Root rot severity and root length were assessed at 2, 4, 7, and 10 days after inoculation (DAI). At C18, root rot was greatest when soybean was inoculated with P. lutarium or P. sylvaticum at GS1 (seed imbibes water), and P. oopapillum or P. torulosum at GS1, GS2 (radicle elongation), and GS3 (hypocotyl emergence). After CS, soybean susceptibility to P. lutarium and P. sylvaticum was reduced compared to C18 for inoculation at all GSs except GS5 (unifoliate leaf emergence). Conversely, root rot by P. oopapillum and P. torulosum was greater after CS compared to C18. Data from this study demonstrate that greater root rot, and consequently more damping-off, is likely if infection occurs at early germination stages before seedling emergence.

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Oxathiapiprolin Alone or Mixed with Metalaxyl Seed Treatment for Management of Soybean Seedling Diseases Caused by Species of Phytophthora, Phytopythium, and Pythium

Cited by 8 publications

References 73 publications

Use of oxathiapiprolin for controlling soybean root rot caused by Phytophthora sojae: efficacy and mechanism of action

Use of oxathiapiprolin for controlling soybean root rot caused by Phytophthora sojae: efficacy and mechanism of action

Comparative Performance of Fungicides, Biofungicides, Host-plant Defense Inducers, and Fertilizer in Management of Phytophthora Root Rot on Boxwood

Effect of Infection Timing by Four Pythium spp. on Soybean Damping-Off Symptoms with and Without Cold Stress

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