Effect of Foliar Fungicide Timing on Corn Yield
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Objective
- 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
Results
- 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.