DuPont™ Aproach® Foliar Fungicide Effect on Corn and Soybean Yield


  • Evaluate the effect of DuPont™ Aproach® foliar fungicide applications on corn and soybean yield performance in northeastern Indiana.

Study Description

Corn Trials

Plot Layout:          Field-length strips

Locations:              27 in northeastern Indiana

Treatments:           Aproach foliar fungicide at VT growth stage untreated

Soybean Trials

Plot layout:            Field-length strips

Locations:              10 in northeastern Indiana

Treatments:            Aproach foliar fungicide at R3 growth untreated.

Map: corn and soybean research locations

2013 Growing Season Conditions

  • In 2013, northeastern Indiana experienced a wet and cool growing season. Foliar diseases were prevalent with infestations of gray leaf spot and northern corn leaf blight in many corn fields and white mold in soybean fields.


Corn Trials

  • In 2013, the average yield advantage associated with Aproach foliar fungicide application to corn at the VT growth stage was 6.2 bu/acre across 27 locations in northeastern Indiana.
  • These results are similar to those observed in a long-term survey of Pioneer fungicide trials, in which the average yield response to fungicide treatment was 6.7 bu/acre across 587 North American trials from 2007-2012. 
Chart: Aproach Corn Trials

Soybean Trials

  • The average yield advantage associated with Aproach foliar fungicide application to soybean at the R3 growth stage was 2.7 bu/acre across 10 locations in northeastern Indiana.
  • Similar results were observed in previous Pioneer research, including an average yield response to fungicide treatment of 2.5 bu/acre across 148 on-farm trials from 2007-2011 and 3.3 bu/acre in small-plot research.

2013 data are based on average of all comparisons made in 27 locations through 11/20/2013. 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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