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Corn Response to Fungicide Application Timing

January 17, 2022

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Corn Response to Fungicide Application Timing - 2021

TRIAL OBJECTIVE

  • Fungicides are often used to protect corn from disease and help producers reach higher yield potential, but there are multiple timings that the fungicide can be applied.

  • The goal of this trial was to look at the yield impact of one or multiple applications Delaro® Complete Fungicide on three corn products.

RESEARCH SITE DETAILS

Location Gothenburg, NE
Soil Type Hord silt loam
Previous Crop Sorghum
Tillage Type Strip tillage

Planting Date 04/26/21
Harvest Date 11/04/21
Potential Yield (bu/acre) 280
Seeding Rate (seeds/acre) 36,000


Table 1. Trial treatments including corn products of varying relative maturity (RM), fungicide rates, and application timing.

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  • The study was setup in a split-plot design with four replications. Fungicide treatments were the whole plot, and corn products were the sub-plot.

  • A base fertilizer application of 25 lb/acre nitrogen (N), 60 lb/acre phosphorus (P), 25 lb/acre sulfur (S), 0.25 lb/acre zinc (Zn) was applied with a strip-till application across all treatments on April 23, 2021.

  • A stream bar broadcast application of 100 lb/acre N was made on 5/12/2021.

  • An additional 60 lb/acreN was applied with 360 Yield Center Y-drops on 6/18/2021 at the V7 growth stage. Weed control consisted of a VE application of 5 oz/acre Corvus® herbicide , 2.0 pt/acre Harness® , 1 qt/acre Atrazine 4L, and 1 qt/acre Roundup® PowerMAX on 5/8/21 followed by a post-emerge application of 3.0 oz/acre Laudis® herbicide , 3 pt/acre Warrant® Herbicide , and 12 oz/acre DiFlexx® herbicide , and 1 qt/ac Roundup® PowerMAX on 6/15/2021. Weed control was excellent season long.

  • Corn was sprinkler irrigated with a total of 5.5 inches of irrigation applied during the growing season.

  • Dry conditions during the growing season led to little fungal disease development in the trial.

  • Plots were combine harvested. Grain moisture content, test weight, and total weight were determined. Statistical analysis for Fisher’s LSD was performed.


UNDERSTANDING THE RESULTS

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Figure 1. Average corn yields for three corn products as impacted by two fungicide rates and timings at the Bayer Water Utilization Learning Center, Gothenburg, NE (2021).

  • Yield was improved by both fungicide application timings over the untreated control even with the dry conditions and low disease pressure observed at the end of the growing season.
    • The VT application alone showed a 5.7 bu/acre advantage over the untreated control.
    • The V6+VT application had a 15 and 9.7 bu/acre advantage over the untreated control and VT application respectively.

KEY LEARNINGS

  • The key benefit observed with Delaro® Complete Fungicide applications was an increase in corn yield for both application strategies.

  • Applying an early V6 application of Delaro® Complete Fungicide along with a VT application in sequence provided the highest yields in this study.

  • The yield improvement has been consistent across both the 2020 and 2021 growing seasons at the Bayer Water Utilization Learning Center in Gothenburg, NE.

  • Farmers should check with their local Bayer Crop Science seeds sales team member to discuss the right corn product and management plan for their fields.


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