Corn Yield Response to DuPont™ Aproach® Prima Fungicide (Southern U.S.)

Objective

  • Evaluate corn yield response to DuPont™ Aproach® Prima fungicide applied at the VT-R1 growth stage on Pioneer® brand corn hybrids.

Study Description

Plot Layout:    On-farm strip trials

Locations:        7 (Ala., Ark., Ga., Ky., Miss.)

Year:                  2015

Fungicide Treatment¹:

  • Aproach Prima fungicide (6.8 fl oz/acre at VT-R1) Non-treated control
  • Non-treated control

Pioneer brand corn hybrids:

Hybrid/Brand²:

  • P1197YHR (YGCB, HX1, LL, RR2)
  • P1637YHR (YGCB, HX1, LL, RR2)
  • P1739YHR (YGCB, HX1, LL, RR2)
  • P1916YHR (YGCB, HX1, LL, RR2)

Data Collected: Corn yield (bu/acre)

¹ Do not exceed 6.8 fl.oz/A per crop. Don’t tank mix with an adjuvant (e.g. crop oil concentrate) when spraying between the V8 -- VT corn growth stage. The minimum retreatment interval in corn is 7 days. The minimum time (PHI) between application and harvest for grain or ear is 30 days and for silage is 20 days.

² All Pioneer products are hybrids unless designated with AM1, AM, AMRW, AMX, AMT, and AMXT, in which case they are brands.

Fungicide Treated

Comparison of corn field treated with DuPont(TM) Aproach® Prima fungicide and non-treated corn field near Winchester, Ark.

Pioneer® hybrid P1916YHR treated with 6.8 fl oz/acre of DuPont

Aproach Prima fungicide on July 16, 2015 near Winchester, Ark.

Application was made using a spray volume of 7 gal/acre by air at the

R2 corn growth stage.


Southern rust pressure was low at the time of application but increased

in severity and ultimately caused premature death in the non-treated

check before the end of the season. Using a 1-9 scale where 1 = no

infection and 9 = nearly all foliage covered with rust pustules and

premature death, Aproach Prima fungicide-treated strips were rated 4

on average compared to non-treated strips which were rated 7.

Results

Average yield of corn treated with Aproach Prima fungicide at the VT-R1 corn growth stage and non-treated corn.

Figure 1. Average yield of corn treated with Aproach Prima fungicide at the VT-R1 corn growth stage and non-treated corn.

Data averaged over 7 locations and 29 paired comparisons from Ala., Ark., Ga., Ky., and Miss. & Tenn. in 2014-15.

Corn yield response to Aproach Prima fungicide applied at the VT-R1 corn growth stage by location and hybrid.

Figure 2. Corn yield response to Aproach Prima fungicide applied at the VT-R1 corn growth stage by location and hybrid.

Data represent 7 locations and 29 paired comparisons from Ala., Ark., Ga., Ky. and Miss. & Tenn. in 2014-15. Red dashed line represents the breakeven yield response of 6 Bu/A assuming a corn selling price of $3.75 per bushel.

Soybean yield response to Aproach Prima fungicide treatment by variety.

Figure 3. Corn yield response to Aproach Prima fungicide applied at the VT-R1 corn growth stage by hybrid.

Data represent 3 locations and 14 paired comparisons from Ark. and Miss. in 2015. The number of observations by hybrid vary. Red dashed line represents the breakeven yield response of 6 bu/acre assuming a corn selling price of $3.75 per bushel.

Summary

Summary

  • Averaged over 7 locations and 29 paired comparisons, corn treated with Aproach Prima fungicide yielded 11 bu/acre more than non-treated corn (Figure 1).
  • Aproach Prima fungicide applied at the VT-R1 growth stage produced positive economic returns in 19 of 29 comparisons or 66% of the time (Figure 2).
  • Yield responses to Aproach Prima fungicide ranged from 10 bu/acre with Pioneer hybrid P1739YHR to over 30 bu/acre with Pioneer hybrid P1197YHR . On average, a positive economic return occurred with all hybrids evaluated (Figure 3).

 

Non-treated corn leaf with southern rust.
Corn leaf with southern rust that has been treated with Aproach Prima fungicide 6.8 fl oz/A at V8.
Corn leaf with southern rust that has been treated with Aproach Prima fungicide 6.8 fl oz/acre at V8 fb 6.8 fl oz/acre at R1.

Corn ear leaves infested with Southern Rust in 2014 near

Camilla, Ga. Non-treated leaf (top), Aproach Prima fungicide

6.8 fl oz/acre at V8 (middle) and Aproach Prima fungicide 6.8 fl oz/A at V8 fb 6.8

fl oz/A at R1 (bottom).

* For research purposes only. Sequential spray programs of this nature should utilize DuPont™ Aproach® fungicide at a rate of 3-6 fl oz/acre followed by Aproach Prima fungicide at a rate of 6.8 fl oz/acre. Aproach Prima fungicide can only be applied once per growing season according to label instructions.

Authors: Darrin Malone and Dan Poston

The foregoing is provided for informational use only. Please contact your Pioneer sales professional for information and suggestions specific to your operation. 2015 data are based on average of all comparisons made in seven locations through Nov. 16, 2015. Multi-year and multi-location is a better predictor of future performance. Do not use these or any other data from a limited number of trials as a significant factor in product selection. Product responses are variable and subject to a variety of environmental, disease, and pest pressures. Individual results may vary.

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YGCB,HX1,LL,RR2 (Optimum® Intrasect®) - Contains the YieldGard® Corn Borer gene and Herculex® I gene for resistance to corn borer.
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