Dicarboximide-Resistant Strains of Microdochium Nivale in New Zealand.

Pennucci, Annamarie; Beever, Ross E.; Laracy, E. P.

doi:10.1071/app9900038

Cited by 6 publications

(7 citation statements)

References 7 publications

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“…However, this level has not resulted in reported full‐blown field resistance, since iprodione applications are still effective, but some superintendents have reported decreased duration of efficacy. The isolates of M. nivale tested here showed similar iprodione sensitivity results to those tested by Chastagner and Vassey (1982) and Pennucci et al (1990). The EC 50 values for our isolates with reduced sensitivity ranged between 14.2 and 40.8 μg mL −1 , whereas Pennucci et al (1990) reported a range of 14.1 to 54 μg mL −1 .…”

Section: Discussionsupporting

confidence: 86%

“…The isolates of M. nivale tested here showed similar iprodione sensitivity results to those tested by Chastagner and Vassey (1982) and Pennucci et al (1990). The EC 50 values for our isolates with reduced sensitivity ranged between 14.2 and 40.8 μg mL −1 , whereas Pennucci et al (1990) reported a range of 14.1 to 54 μg mL −1 . Pennucci et al (1990) also calculated a resistance factor of 12 for their resistant isolates and stated that “Fusarium patch symptoms (on the course greens) were common despite, in some instances, the regular and repeated use of iprodione.” Whereas Chastagner and Vassey (1982) did not report EC 50 values, they reported that iprodione failed to control Fusarium patch on two golf greens.…”

Section: Discussionsupporting

confidence: 86%

“…The EC 50 values for our isolates with reduced sensitivity ranged between 14.2 and 40.8 μg mL −1 , whereas Pennucci et al (1990) reported a range of 14.1 to 54 μg mL −1 . Pennucci et al (1990) also calculated a resistance factor of 12 for their resistant isolates and stated that “Fusarium patch symptoms (on the course greens) were common despite, in some instances, the regular and repeated use of iprodione.” Whereas Chastagner and Vassey (1982) did not report EC 50 values, they reported that iprodione failed to control Fusarium patch on two golf greens. Resseler and Buchenauer (1988a) were able to generate iprodione‐resistant mutants in vitro with resistance factors of 20 to 200, but these isolates were not normal and had sensitivity to osmotic pressures, unlike sensitive wild‐type isolates (Resseler and Buchenauer, 1988b).…”

Section: Discussioncontrasting

confidence: 59%

“…Based on results of the full range concentration tests, and previous literature on iprodione resistance (Chastagner and Vassey 1982; Pennucci et al, 1990), a concentration of 10 μg mL −1 for iprodione was chosen as the discriminatory concentration for further testing. This discriminatory concentration was chosen by analyzing the data to see at which point presumed sensitive isolates would be fully inhibited, whereas isolates showing reduced sensitivity would still show growth.…”

Section: Methodsmentioning

confidence: 99%

“…The first report was by Chastagner and Vassey (1982), who documented the presence of iprodione‐tolerant M. nivale isolates where Rhône‐Poulenc had previously performed turf field trials with iprodione (Seattle, WA). A second report was by Pennucci et al (1990), who collected iprodione‐tolerant M. nivale from several turf locations in New Zealand.…”

mentioning

confidence: 99%

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Resistance to Dicarboximide Fungicides in a Canadian Population of Microdochium nivale

Gourlie

Hsiang

2017

Intl Turfgrass Soc Res J

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Isolates of Microdochium nivale suspected of resistance to iprodione [3‐(3,5‐Dichlorophenyl)‐N‐isopropyl‐2,4‐dioxoimidazolidine‐1‐carboxamide] were collected from a golf course in Victoria, British Columbia (BC), Canada, in Fall 2015. The 9 BC isolates and 12 other reference isolates from around the world were tested with four concentrations of iprodione: 0, 1, 10, and 100 μg mL−1. The BC isolates showed a half maximal effective concentration (EC50) range of 14.2 to 40.8 μg mL−1 with a mean of 24.2 μg mL−1, while the non‐BC isolates showed an EC50 range of 1.2 to 4.3 μg mL−1 with a mean of 1.9 μg mL−1. The yielded resistance factor (EC50 resistant/EC50 sensitive) of 12.7 implies that these BC isolates have been selected for reduced sensitivity to iprodione. This level of resistance may be responsible for the reduced efficacy, particularly the observed reduced interval of control, but further research is needed to assess this. A test of >100 isolates of M. nivale from a worldwide collection using a discriminatory concentration of 10 μg mL−1 of iprodione showed four isolates with similar levels of reduced sensitivity, but these were the only isolates from their respective populations.

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Section: Discussionsupporting

confidence: 86%

Section: Discussionsupporting

confidence: 86%

Section: Discussioncontrasting

confidence: 59%

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

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Resistance to Dicarboximide Fungicides in a Canadian Population of Microdochium nivale

Gourlie

Hsiang

2017

Intl Turfgrass Soc Res J

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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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Matsumoto¹,

Hsiang²

2016

Snow Mold

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Dicarboximide-Resistant Strains of Microdochium Nivale in New Zealand.

Cited by 6 publications

References 7 publications

Resistance to Dicarboximide Fungicides in a Canadian Population of Microdochium nivale

Resistance to Dicarboximide Fungicides in a Canadian Population of Microdochium nivale

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

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