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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
Authors: Gina Brown-Guedira, Carl Griffey, Fred Kolb, Anne McKendry, J. Murphy, and David Sanford

75 85 Griffey, C.A. 2005. Identification and Incorporation of FHB Resistance in Winter Wheat: An Overview of Progress and Strategies. In: Canty, S.M., Boring, T., Wardwell, J

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, G., Dion, Y., Rioux, S., Gilbert, J., Somers, D. and Martin, R.A. 2008. A systemic approach for the development of FHB resistant germplasm accelerates genetic progress. Cer. Res. Comm. (in press). Gilbert, J. and Woods, S

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of QTLs for FHB resistance from Sumai 3 and F 201R on phenotypic resistance traits and DON content. Romanian Agricultural Research 23 :13–21. Ittu G. Effect of QTLs for FHB

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Cereal Research Communications
Authors: Sixin Liu, Michael Pumphrey, Bikram Gill, Harold Trick, Julia Zhang, Jaroslav Dolezel, Boulos Chalhoub, and James Anderson

Pumphrey, M.O., Bernardo, R., Anderson, J.A. 2007. Validating the Fhb1 QTL for Fusarium head blight resistance in near-isogenic wheat lines developed from breeding populations. Crop Sci. 47 :200

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1348 Mesterhazy, A., Bartok, J., Lamper, C. 2003. Influence of wheat cultivar, species of Fusarium and isolate aggressiveness on the efficacy of fungicides for control of FHB. Plant Dis

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Cereal Research Communications
Authors: A. Comeau, F. Langevin, V. Caetano, S. Haber, M. Savard, H. Voldeng, G. Fedak, Y. Dion, S. Rioux, J. Gilbert, D. Somers, and R. Martin

., Buerstrmayr, H., Toth, B., Lehoczki-Krsjac, S., Szabo-Hevér, A., Lemmens, M. 2007. An improved strategy for breeding FHB resistant wheat must include type I resistance. 5th Canadian Fusarium Head Blight Workshop. pp. 51

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107 503 508 Comeau, A., Langevin, F., Eudes, F. 2003. Mechanisms of resistance and tolerance to FHB. Proc. of the Third CWFHB Meeting Winnipeg Dec. 2003. p. 88

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931 938 Cuthbert, P.A., Somers, D.J., Thomas, J., Cloutier, S., Brulé-Babel, A. 2006. Fine mapping Fhb1 , a major gene controlling Fusarium head blight resistance in bread

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Pseudomonads, including P. fluorescens strain MKB 158, can inhibit the development of Fusarium seedling blight disease on wheat and barley. Application of this and other pseudomonads as head sprays inhibits the development of Fusarium head blight disease (FHB) disease on wheat and barley under both field and glasshouse conditions. P. fluorescens strains MKB 158 and MKB 249 also reduced DON contamination of grain under field conditions. Evidence suggests that P. fluorescens does not directly inhibit the growth of Fusarium , but that it potentiates host resistance against this disease. Transcriptome profiling identified barley genes differentially expressed as early events in (a) bacterium-induced resistance to seedling blight and (b) heads following P. fluorescens and Fusarium culmorum co-inoculation. Bacterium-potentiated resistance to Fusarium affects the transcription of many genes that are involved in diverse processes, including cell rescue and defence, metabolism, cell cycle and DNA replication and signalling.

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