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Corn Response to Fungicide Application Timing - 2021
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
|Hord silt loam
Table 1. Trial treatments including corn products of varying relative maturity (RM), fungicide rates, and application timing.
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
- 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.
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.
Delaro® 325 SC Fungicide Applications on Corn - 2020
Fungicide applications are an in-season management decision that can provide value but deciding how often to apply a fungicide can be complicated.
The objective of this trial was to look at the impact of single or multiple Delaro® 325 SC fungicide applications across several corn products.
RESEARCH SITE DETAILS
|Hord silt loam
- Experimental design was a split-plot with four replications per treatment. Fungicide application treatments correspond to the entire plot and the corn germplasm was the sub-plot Three corn products were paired with two Delaro® 325 SC fungicide application programs and one non-treated check (Table 1).
- Corn was sprinkler irrigated with a total of 10 inches of irrigation applied in addition to 12 inches of rain received during the growing season.
- It was a relatively dry end to the growing season and minimal fungal disease development was found in the trial.
- Fertility applied included
- 70 lb phosphorus (P)/acre, 15 lb sulfur (S)/acre, and 27.5 lb nitrogen (N)/acre band applied with strip till on 4/26/20,
- 100 lb N/acre applied by stream bar on 4/28/20, and
- 15 lb S/acre and 90 lb N/acre applied with 360 Y-DROP® applicators on 6/26/20.
- Weed control consisted of a pre-emergence application of
- 3.0 oz/acre Balance® Flexx herbicide, 2.0 pt/acre Harness® brand herbicide, 1 qt/acre Atrazine 4L herbicide, and 1 qt/acre Roundup PowerMAX® herbicide on 5/1/20,
- Followed by a post-emergence application of 3.0 oz/acre Laudis® herbicide, 3 pt/acre Warrant® herbicide, and 24 oz/acre Moxy® 2E herbicide on 6/10/2020.
- Greensnap, shelled corn weight, and harvest moisture were collected at harvest as a measure of product and fungicide application performance.
Analysis showed that one of the corn products had a different greensnap response to Delaro® 325 SC fungicide treatment as detailed in Table 2.
The 109-RM corn product had a lower percent greensnap with Delaro® 325 SC fungicide applied at the V5+VT growth stage.
Analysis showed the 109-RM corn product had a positive response to fungicide application with Delaro® 325 SC by exhibiting reduced greensnap (Table 2) compared to non-treated control treatment.
Overall, average yield was increased in this irrigated trial with the Delaro® 325 SC fungicide application at VT compared to non-treated control.
The average yield of corn with Delaro® 325 SC fungicide program applied at V5+VT growth stages was significantly higher than the non-treated check plots.
Greensnap mostly occurred in the late vegetative growth stage around V15 to V16 with a severe thunderstorm in the early hours of July 10, 2020.
In this specific field trial, the VT fungicide application complemented with early fungicide application (V5) increased yield by 11 bu/acre across all corn products in a low disease environment.
A fungicide application can improve plant health and potentially reduce yield loss.
Farmers should work with their local Bayer sales team member to decide if a fungicide application of Delaro® 325 SC could be beneficial to their corn production acres.