Winter Wheat Response to Timing of Fungicide Application During the 2020–2021 Growing Season

Foliar fungicides applied at the flag leaf stage can improve wheat grain yield in Kansas, but there is limited information on impact of earlier or combined applications fungicide yield. We conducted a field study six Kansas locations during 2020–2021 growing season to evaluate and test weight winter variety WB-Grainfield response different application timings. The trial was randomized complete block design with four replications (1) non-treated control; Topguard 5 ounces per acre (2) jointing, (3) heading; (4) jointing plus heading. two contrasting soil textures near Ashland Bottoms, previous crops resulting optimum- late-sowing dates Belleville, one location Hutchinson, another Manhattan. Statistical analysis indicated that for both weight, were significant timing by interactions, suggesting location-specific. Grain ranged from 28 bushels no treatment Manhattan 109.9 bu/a dual-fungicide Belleville sown optimum time. Depending environment, increase due as compared untreated control 0.7 8.0 application, -1.8 19.3 heading -1.4 17.7 dual application. weights 54.1 pounds bushel without trials 62.8 lb/bu Hutchinson Test benefits depended -0.1 1.7 -0.9 2.6 -0.3 3.9 This research an initial step determining foliar weight. results this suggest are substantial, however, magnitude environmental conditions experienced season.