Soybean Yield Response to Foliar Fungicide and Insecticide

Rationale and Objective

  • The use of foliar fungicides in soybeans has grown tremendously over the last several years. Many growers are now adding an insecticide in combination with the fungicide for late-season insect control.
  • Trials were conducted in southeastern Nebraska to determine the yield effect of foliar fungicide + insecticide applications in soybean.


Study Description

Locations: 9 in southeast Nebraska
Varieties: Plot cooperators had their choice of Pioneer®
brand Y Series or T Series soybean variety
Fungicide: DuPont™ Aproach® @ 6 oz/acre
Insecticide: DuPont™ Asana® XL @ 9 oz/acre
Application Timing: R2-R3 stage in soybean (pod set - pod
elongation) either by air or ground application


  • During the 2013 growing season, both foliar disease and insect pressure were low in the study area.
  • In 2013, the combination of Aproach and Asana XL fungicides led to an average yield advantage of 1.3 bu/acre over the untreated check across 9 locations.


  • A positive yield response was seen at 6 of the 9 locations.
  • No significant negative yield response was seen from the application of Aproach and Asana XL fungicides.


Chart: Aproach + Asana XL Fungicide Yield Advantage vs. Untreated


Pioneer® brand products are provided subject to the terms and conditions of purchase which are part of the labeling and purchase documents. 2013 data are based on average of all comparisons made in 9 locations through Dec. 17, 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.

All products are trademarks of their manufacturers.

Always read and follow label instructions.