Corn Response to Fungicide Application Timing

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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 of Delaro® Complete fungicide on three Fontanelle Hybrids® corn products.

 

RESEARCH SITE DETAILS

LocationGothenburg, NE   
Soil Type Hord silt loam  

Previous
Crop
Soybean  
Tillage
Type
Strip-Till 


 
Planting Date04/26/21  
Harvest Date11/04/21 

Potential Yield
 (bu/acre)
280  
Seeding Rate
(seeds/acre)
36,000


 

Table 1. Trial treatments including Fontanelle Hybrids® corn products, fungicide rates, and application timing 

image
  • The study was setup as a randomized 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 nitrogen(N)/acre, 60 lb phosphorus (P)/acre, 25 lb sulfur (S)/acre, 0.25 lb zinc (Zn)/acre was applied with a strip-till applicator across all treatments on April 23, 2021.

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

  • An additional 60 lb N/acre was applied with 360 Yield Center Y-drops on 6/18/2021 at the V7 growth stage.

  • Weed control consisted of a VE growth stage application of 5 oz/acre Corvus® herbicide, 2.0 pt/acre Harness® herbicide,1 qt/acre Atrazine 4L Herbicide, 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

image Figure 1. Average corn yields for three Fontanelle Hybrids® corn products combined over all fungicide application timings at the Bayer Water Utilization Learning Center, Gothenburg, NE (2021).
  • Figure 1 yields represent the average of all plot yields including the non-treated, V6+VT, and VT fungicide applications.

  • Fontanelle Hybrids® corn products all had high yields in the trial and went well above the targeted potential yield and yield goal fertilizer rates. (Figure 1) 

 
image Figure 2. Average corn yields impacted by two fungicide rates and timing at the Bayer Water Utilization Learning Center, Gothenburg, NE (2021).
  • Yield was improved by both fungicide application timings over the non-treated check even with the dry conditions and low disease pressure observed at the end of the growing season (Figure 2).

  • The VT application alone showed a 5.7-bushel advantage over the untreated control (Figure 2).

  • The V6+VT application had a 15- and 9.7-bushel advantage over the untreated control and VT application timing, respectively.

 

KEY LEARNINGS

  • In this study, the key benefit observed with Delaro® Complete Fungicide application 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 2021.

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

Delaro® 325 SC Fungicide Applications on Corn - 2020

TRIAL OBJECTIVE

  • 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 fungicide Delaro® 325 SC fungicide applications across several Fontanelle Hybrids® corn products.

 

RESEARCH SITE DETAILS

LocationGothenburg, NE   
Soil Type Hord silt loam  

Previous
Crop
Sorghum  
Tillage
Type

Strip tillage  


 
Planting Date04/30/20  
Harvest Date10/31/20 

Potential Yield
 (bu/acre)
250  
Seeding Rate
(seeds/acre)
36,000

 
  • 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 Fontanelle Hybrids® corn products were sprayed with two different 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.
 
image Table 1. Treatment information including corn product and Delaro® 325 SC fungicide application rates and timing.

UNDERSTANDING THE RESULTS

image Table 2. Trial treatments and resulting average yield (bu/acre) and percent greensnap.
  • Analysis showed Fontanelle® 09G219 brand blend had a positive response to fungicide application with Delaro® 325 SC by exhibiting reduced greensnap (Table 2) compared to non-treated control treatment.   
image Figure 1. Typical evidence of greensnap at the end of the season. Damage originated from high winds during a storm in mid-July 2020. Most snap occured at or one node above the main ear.
image Figure 2. Average corn yield response to Delaro® 325 SC fungicide programs.
  • 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 a 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.

KEY LEARNINGS

  • 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 Fontanelle Hybrids® sales team member to decide if a fungicide application of Delaro® 325 SC could be beneficial to their corn production acres.

 
 
 
 

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