<abstract xmlns="http://www.w3.org/1999/xhtml">
<p>The common control method of leaf blotches is the application of fungicides; however, the results of trials are inconsistent. The aim of the present study was to evaluate the impact of the fungicide treatment intensity on the severity of leaf blotches and to assess the correlation between the development of diseases and winter wheat (<italic>Triticum aestivum</italic>) yield in 2018–2021. The development of diseases was evaluated regularly. In this study, the severity of leaf blotches at the medium milk ripening (GS 75–77) was used. Tan spot dominated in 2018, 2019, and 2021, but Septoria tritici blotch dominated in 2020. Fungicides significantly decreased the severity of tan spot and Septoria tritici blotch, but the efficacy of used fungicide treatment schemes differed during trial years – it was more pronounced under higher pressures of leaf blotches. In the year with a high severity of Septoria tritici blotch, the best efficacy was obtained when fungicide was used two times (at GS 32–33 and GS 55–59), but for tan spot – when the dose of fungicide was done in two or three applications. Usage of fungicides increased wheat yield only under high pressure of diseases. A strong significant correlation between the severity of Septoria tritici blotch at GS 75–77 and grain yields was established only in 2020, when the severity of the disease was higher.</p>
</abstract>

The common control method of leaf blotches is the application of fungicides; however, the results of trials are inconsistent. The aim of the present study was to evaluate the impact of the fungicide treatment intensity on the severity of leaf blotches and to assess the correlation between the development of diseases and winter wheat (Triticum aestivum) yield in 2018–2021. The development of diseases was evaluated regularly. In this study, the severity of leaf blotches at the medium milk ripening (GS 75–77) was used. Tan spot dominated in 2018, 2019, and 2021, but Septoria tritici blotch dominated in 2020. Fungicides significantly decreased the severity of tan spot and Septoria tritici blotch, but the efficacy of used fungicide treatment schemes differed during trial years – it was more pronounced under higher pressures of leaf blotches. In the year with a high severity of Septoria tritici blotch, the best efficacy was obtained when fungicide was used two times (at GS 32–33 and GS 55–59), but for tan spot – when the dose of fungicide was done in two or three applications. Usage of fungicides increased wheat yield only under high pressure of diseases. A strong significant correlation between the severity of Septoria tritici blotch at GS 75–77 and grain yields was established only in 2020, when the severity of the disease was higher.

Impact of Fungicide Treatment Schemes on the Severity of Leaf Blotches in Winter Wheat

Latvia University of Life Sciences and Technologies

Rural Sustainability Research

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

The common control method of leaf blotches is the application of fungicides; however, the results of trials are inconsistent. The aim of the present study was...

Impact of Fungicide Treatment Schemes on the Severity of Leaf Blotches in Winter Wheat

Publié en ligne: 05 sept. 2023

Pages: 27 - 34

Reçu: 26 janv. 2023

Accepté: 06 juin 2023

DOI: https://doi.org/10.2478/plua-2023-0004

Mots clés
tan spot, Septoria tritici blotch, disease control, yield

© 2023 Agrita Švarta et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Impact of Fungicide Treatment Schemes on the Severity of Leaf Blotches in Winter Wheat

Publié en ligne: 05 sept. 2023

Pages: 27 - 34

Reçu: 26 janv. 2023

Accepté: 06 juin 2023

DOI: https://doi.org/10.2478/plua-2023-0004

Mots cléstan spot, Septoria tritici blotch, disease control, yield

© 2023 Agrita Švarta et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Mots clés
tan spot, Septoria tritici blotch, disease control, yield