[KSCI] Korea Science Citation Index Service

http://dx.doi.org/10.5423/PPJ.OA.04.2018.0056

Winter Wheat Grain Yield Response to Fungicide Application is Influenced by Cultivar and Rainfall

Byamukama, Emmanuel (Department of Agronomy, Horticulture, and Plant Science, South Dakota State University)
Ali, Shaukat (Department of Agronomy, Horticulture, and Plant Science, South Dakota State University)
Kleinjan, Jonathan (Department of Agronomy, Horticulture, and Plant Science, South Dakota State University)
Yabwalo, Dalitso N. (Department of Agronomy, Horticulture, and Plant Science, South Dakota State University)
Graham, Christopher (Department of Agronomy, Horticulture, and Plant Science, South Dakota State University)
Caffe-Treml, Melanie (Department of Agronomy, Horticulture, and Plant Science, South Dakota State University)
Mueller, Nathan D. (Department of Agronomy and Horticulture, University of Nebraska-Lincoln)
Rickertsen, John (NDSU Hettinger Research Extension Center)
Berzonsky, William A. (Bayer CropScience LP, North American Wheat Breeding)

Publication Information

The Plant Pathology Journal / v.35, no.1, 2019 , pp. 63-70 More about this Journal

Abstract

Winter wheat is susceptible to several fungal pathogens throughout the growing season and foliar fungicide application is one of the strategies used in the management of fungal diseases in winter wheat. However, for fungicides to be profitable, weather conditions conducive to fungal disease development should be present. To determine if winter wheat yield response to fungicide application at the flowering growth stage (Feekes 10.5.1) was related to the growing season precipitation, grain yield from fungicide treated plots was compared to non-treated plots for 19 to 30 hard red winter wheat cultivars planted at 8 site years from 2011 through 2015. At all locations, Prothioconazole + Tebuconazole or Tebuconazole alone was applied at flowering timing for the fungicide treated plots. Grain yield response (difference between treated and non-treated) ranged from 66-696 kg/ha across years and locations. Grain yield response had a positive and significant linear relationship with cumulative rainfall in May through June for the mid and top grain yield ranked cultivars ( $R^2=54%$ , 78%, respectively) indicating that a higher amount of accumulated rainfall in this period increased chances of getting a higher yield response from fungicide application. Cultivars treated with a fungicide had slightly higher protein content (up to 0.5%) compared to non-treated. These results indicate that application of fungicides when there is sufficient moisture in May and June may increase chances of profitability from fungicide application.

Keywords

fungicide; weather; winter wheat; yield response;

Citations & Related Records

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