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Tropical Plant Pathology

, Volume 44, Issue 1, pp 82–93 | Cite as

Differential susceptibility to the mycoparasite Paraphaeosphaeria minitans among Sclerotinia sclerotiorum isolates

  • Philippe C. NicotEmail author
  • Félicie Avril
  • Magali Duffaud
  • Christel Leyronas
  • Claire Troulet
  • François Villeneuve
  • Marc Bardin
Original Article

Abstract

The mycoparasitic fungus Paraphaeosphaeria minitans (formerly Coniothyrium minitans), is increasingly used by farmers to reduce soilborne inoculum of Sclerotinia sclerotiorum. In France, its field efficacy tends to be higher in the North than in the South, leading to the hypothesis of possible regional differences in the susceptibility of the pathogen to the biocontrol agent. A standardized assay was developed and four quantitative criteria were used to assess the susceptibility to P. minitans of 75 S. sclerotiorum isolates collected from different regions of France. There was no significant difference between the group of isolates from the North and that from the South, but wide differences were observed among isolates, with consistent responses for all quantitative criteria. This study suggests that biocontrol efficacy might vary locally depending on the frequency of less susceptible isolates and it brings to attention the possibility that selection pressure could lead to a gradual increase in the frequency of less susceptible isolates, as this biocontrol method becomes widely adopted by farmers. To our knowledge, this is the first report of the variable susceptibility of S. sclerotiorum to a commercialized strain of P. minitans and the first detailed characterization of a large group of isolates from France for traits related to fitness, such as mycelial growth and production of sclerotia.

Keywords

Biological control Coniothyrium Hyperparasite Durability Sclerotia White mold 

Notes

Acknowledgements

This work was supported in part by funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement N° 633184 (“EUCLID” project) and by a CASDAR grant from the French Ministry of Agriculture together with the Scientific Interest Group “GIS PICLég” (“ScleroLeg” project). The authors thank all the field experimenters of the French technical institutes (CTIFL, ACPEL, APEF, CEFEL, Invenio, SILEBAN, Terres Inovia UNILET) who collaborated in the project and who collected the isolates used in the present study.

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Copyright information

© Sociedade Brasileira de Fitopatologia 2018

Authors and Affiliations

  1. 1.Pathologie végétale, INRAMontfavetFrance
  2. 2.CTIFL, centre de LanxadePrigonrieuxFrance

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