Effect of Foliar Fungicide Timing on Corn Yield


  •  Compare yield response to early and late-season foliar fungicide applications on corn.

Study Description

Locations:             38 on-farm trials across NE, KS and eastern CO in 2011
                                and 2012 (see map below).

Plot Layout:           100+ acre fields split into 1/4’s

Hybrids:              18 hybrids (treatments were compared using the same
                              hybrid within a location)

Treatments:       Fungicide application at V6, VT, V6+VT growth stages



  • Foliar disease pressure was generally low in 2011 and 2012 across locations.
  • Fungicide application at V6 was associated with a slight increase in average yield across all site-years.
  • Application of foliar fungicide at VT growth stage resulted in a 3.46 bu/acre average yield increase across all site-years.
  • Sequential application of foliar fungicide at V6 followed by VT resulted in an average yield advantage of 4.27 bu/acre across all site-years. 
  • The average yield response to treatments including a VT fungicide application was below long-term averages seen in other studies, likely due to below average disease pressure in 2011 and 2012.

2011-2012 data are based on average of all comparisons made in 38 locations through November 21, 2012. 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.