Effect of Foliar Fungicide Timing on Corn Yield

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

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.