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Reduction of Fusarium head blight and deoxynivalenol in wheat with early fungicide applications of prothioconazole

Abstract : Numerous studies have identified the benefit of fungicides applied at flowering (Zadoks Growth Stage (GS) 59-69) in the reduction of Fusarium head blight (FHB) and the reduction of deoxynivalenol (DON) in harvested wheat grain. Two experiments were performed to identify the ability of prothioconazole (Proline®, Bayer CropScience) at three timings to reduce FHB and resulting DON in harvested grain of wheat. Prothioconazole (150 g ha-1) was applied to plots of wheat at GS31, 39 and 65 in a full factorial design. Plots were inoculated with Fusarium-infected oat grain at GS30 and mist-irrigated at GS65 to encourage head blight development. Plots were assessed for head blight symptoms at GS77 and harvested grain was analysed for yield, specific weight, thousand grain weight and DON. Factorial ANOVA identified prothioconazole applications at each timing resulted in significant reductions in FHB and DON. The control achieved with combinations of spray timings was additive with no significant interactions. The control of FHB at GS31, GS39 and GS65 was 50, 58 and 83% respectively. The reduction in FHB achieved by all three timings combined was 97% compared to the fully untreated control plots. The reduction of DON after application of prothioconazole at GS31, GS39 and GS65 was 27, 49 and 57% respectively. The application of prothioconazole at all three timings achieved 83% reduction of DON compared to the fully untreated control plots. These experiments have determined, for the first time, significant additional head blight disease control and mycotoxin reduction with applications of a fungicide before flowering.
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Submitted on : Saturday, May 7, 2011 - 2:56:24 AM
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Simon G Edwards, Nigel Godley. Reduction of Fusarium head blight and deoxynivalenol in wheat with early fungicide applications of prothioconazole. Food Additives and Contaminants, 2010, 27 (05), pp.629-635. ⟨10.1080/19440040903515942⟩. ⟨hal-00591169⟩

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