Foliar fungicide applications to corn continue to grow in popularity. According to fungicide manufacturers, crop injury associated with fungicide applications has been reported in a limited number of cases. The most frequent damage was partial to completely arrested cob development. However, properly timing a fungicide application is critical. Exactly how much crop damage can occur if a fungicide is applied at the incorrect growth stage? This goof demonstration set out to measure the potential damage.
This photo shows ears (left) from plants that received a ground application of a fungicide and a non-ionic surfactant (NIS) at the VT growth stage (correct application timing). The ears on the right are from plants that received the same application but at the V14 stage (too early). This photo clearly shows the potential crop injury and yield loss when a fungicide is applied at the incorrect growth stage.
Factors to Consider
Jeff Mathesius, Pioneer agronomy research manager, says foliar fungicides are a tool to help manage disease but it's important that growers understand that tool.
Get additional information on foliar fungicides.