Resumo

SCHOLZ, Ruth; QUINTANA, Lidia; ORTIZ, Aldo  e  KOHLI, Man Mohan. Chemical control of Fusarium head blight of wheat and its effect on grain production and seed quality. Investig. Agrar. [online]. 2021, vol.23, n.1, pp.32-39. ISSN 2305-0683.  https://doi.org/10.18004/investig.agrar.2021.junio.2301559.

Fusarium head blight (FHB), produced mainly by Fusarium graminearum, it is one of the most relevant diseases for wheat production in Paraguay which continues to threaten the economic sustainability of crop producers, causing losses in grain yield and quality. The objective of the experiment was to evaluate different chemical groups of fungicides for the control of Fusarium head blight and its effect on yield and mycotoxin deoxynivalenol levels in wheat grains. The fungicides were applied in three wheat growth stages: head emergence, anthesis and milky grains. All fungicides evaluated (Tebuconazole, Metconazole + Epoxiconazole, Azoxystrobin, Fluxapyroxad + Epoxyconazole + Pyraclostrobin, Azoxystrobin + Benzovindiflupir) significantly decreased the infection levels of Fusarium head blight and increased the yield and thousand grains weight compared with the non-sprayed control. Treatments that included strobilurins in their composition resulted in the highest levels of DON (4.07-4.27 ppm) in wheat grains. Among the fungicides evaluated, Tebuconazole showed the lowest level of DON concentration in grain (1-1.5 ppm).

Palavras-chave : Triticum aestivum; Fusarium graminearum; fungicides; deoxynivalenol.

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