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  • 1 Brussels Office Monsanto Europe N.V Avenue de Tervuren 270-272 1150 Brussels Belgium
  • | 2 The University of Nottingham, Sutton Bonington Plant and Crop Sciences Division, School of Biosciences Loughborough LE12 5RD UK
  • | 3 Harper Adams University College Crop and Environment Research Centre Newport, Shropshire TF10 8NB UK
  • | 4 Sellafield Ltd Seascale, Cumbria CA20 1PG UK
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Saprophytic microflora and non-toxin producing Microdochium spp. capable of causing Fusarium head blight (FHB) have been suggested to affect the development of FHB caused by Fusarium spp., the occurrence of mycotoxins and the efficacy of fungicides for the control of the disease. The effects of metconazole and azoxystrobin on the interactions between Fusarium culmorum and Microdochium spp., Alternaria tenuissima or Cladosporium herbarum on FHB symptom development, Tri5 DNA concentration and deoxynivalenol (DON) production were studied under glasshouse conditions. Results indicated that the sequence of infection of wheat heads and the relative timing of fungicide application can significantly affect FHB severity and the resulting mycotoxin contamination of harvested grain. Introduction of A. tenuissima, C. herbarum or Microdochium spp. to wheat heads at GS 57 before inoculation with F. culmorum at GS 65 generally resulted in increased FHB severity, Tri5 DNA and DON concentration in harvested grain. The greatest increases of FHB severity (266%), Tri5 DNA (79%) and DON (152%) were observed when Microdochium spp. were introduced first at GS 57 and F. culmorum inoculation followed at GS 65. Metconazole generally reduced FHB severity, Tri5 DNA and DON concentration in grain but azoxystrobin was most efficient at reducing DNA of Microdochium spp. in grain.

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Cereal Research Communications
Language English
Size B5
Year of
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1973
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1
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Springer Nature Switzerland AG
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ISSN 0133-3720 (Print)
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