Resistance of<i>Sclerotinia homoeocarpa</i>to Iprodione and Benomyl

Detweiler, A. R.

doi:10.1094/pd-67-627

Cited by 70 publications

(49 citation statements)

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“…Many of these fungicides, particularly systemic fungicides, successfully controlled dollar spot when they were first released, but S. homoeocarpa has developed resistance to several classes of fungicides used for dollar spot control in the United States, including earlier heavy metal-based compounds (2,18), traditional contact fungicides (21), and local or acropetal systemic fungicides such as dicarboximides (6), benzimidazoles (6,24,25), and demethylation inhibitors (DMIs) (8,11). More often than not, S. homoeocarpa exhibits crossresistance (i.e., resistance to more than one fungicide within the same chemical group) or multiple resistance (i.e., resistance to different fungicide classes) (23).…”

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confidence: 99%

Rapid Development of Fungicide Resistance by Sclerotinia homoeocarpa on Turfgrass

Jo¹,

Chang²,

Boehm³

et al. 2008

Phytopathology®

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Dollar spot, caused by Sclerotinia homoeocarpa, is the most prevalent and economically important turfgrass disease in North America. Increasing levels of fungicide resistance, coupled with tightening environmental scrutiny of existing fungicides, has left fewer options for managing dollar spot. More knowledge about S. homoeocarpa populations is needed to improve dollar spot management strategies, especially with respect to minimizing the development of fungicide resistance. Population diversity of S. homoeocarpa was examined using inter-simple sequence repeat markers and vegetative compatibility assays. Two subgroups were found in S. homoeocarpa field populations on both fairway and putting green turfgrass at a research field in Wisconsin. These subgroups were genetically different, vegetatively incompatible, and had different fungicide sensitivities. The frequency of the two genetic subgroups differed significantly between the fairway and putting green, but was uniform within the fairway or within the green. Population dynamics of S. homoeocarpa in response to two systemic fungicides (thiophanate-methyl and propiconazole) were assessed based on in vitro fungicide sensitivity. Dynamics of S. homoeocarpa populations depended on the presence of fungicide-resistant isolates in the initial populations before fungicide applications and changed rapidly after fungicide applications. Shifting of the population toward propiconazole resistance was gradual, whereas thiophanate-methyl resistance developed rapidly in the population. In conclusion, field populations of S. homoeocarpa containing genetically distinct, vegetatively incompatible groups were different on turfgrass that was managed differently, and they were changed rapidly after exposure to fungicides.

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confidence: 99%

Rapid Development of Fungicide Resistance by Sclerotinia homoeocarpa on Turfgrass

Jo¹,

Chang²,

Boehm³

et al. 2008

Phytopathology®

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“…Effective concentration (EC 50 values) four fungal pathogens species were determined as described by Detweiler et al (1983) and Golembiewski et al (1995). Plugs of 5 mm in diameter, contain actively growing mycelium of each fungal species were transferred to PDA amended with compound 1 and in addition to non-amended PDA as control.…”

Section: Inhibition Concentration Of Relative Mycelial Growth By 50% mentioning

confidence: 99%

Antifungal activity of pinosylvin fromPinus densifloraon turfgrass fungal diseases

Lee

Rodriguez

et al. 2017

JABC

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The objective was to examine the antifungal activity of Pinus densiflora extract for the control of turfgrass fungal diseases. Antifungal activities of the various fractions of n-hexane, methylene chloride (Ch), ethyl acetate (EtOAc), and n-butanol from P. densiflora were evaluated against Rhizoctonia solani AG1-1B, R. solani AG2-2IV, Sclerotinia homoeocarpa, R. cerealis, Pythium spp., and Colletotrichum graminicola. The Ch and EtOAc fractions showed antifungal activity against Pythium sp. and C. graminicola in paper disc assay. The effective concentration to produce 50% mycelial inhibition (EC 50 ) using five discriminatory concentrations of pinosylvin (1) from the Ch fraction of P. densiflora was evaluated on R. solani AG1-1B, R. solani AG2-2IV, R. cerealis, and S. homoeocarpa. S. homoeocarpa showed the highest sensitivity with the lowest mean EC 50 value (8.426 μg/ mL) among the four pathogens. Among the three Rhizoctonia pathogens, R. cerealis had the highest mean EC 50 value (99.832 μg/mL) and R. solani AG2-2IV, with the lowest sensitivity, had the lowest EC 50 value (39.696 μg/mL). These results suggested that pinosylvin (1) from P. densiflora could be a valuable lead compound in the improvement of a novel antifungal agent.

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“…Not surprisingly, field resistance was first observed in B. cinerea (Pommer and Lorenz, 1982), M. fructicola (Ritchie, 1983), and Sclerotinia spp. (Detweiler et al, 1983).…”

Section: Signal Transduction: Dicarboximides and Phenylpyrrolesmentioning

confidence: 99%

Detection of Fungicide Resistance

Beckerman¹

2013

Fungicides - Showcases of Integrated Plant Disease Management From Around the World

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Resistance ofSclerotinia homoeocarpato Iprodione and Benomyl

Cited by 70 publications

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Rapid Development of Fungicide Resistance by Sclerotinia homoeocarpa on Turfgrass

Rapid Development of Fungicide Resistance by Sclerotinia homoeocarpa on Turfgrass

Antifungal activity of pinosylvin fromPinus densifloraon turfgrass fungal diseases

Detection of Fungicide Resistance

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