Foliar Applications of Fungicides on Corn during Drought Conditions
Posted: July 12, 2012
The continuing drought has many growers asking questions about foliar applications of a fungicide on tasseling corn. Most labels dictate that applications be made between VT and R1 stages. The labels I reviewed also require that adjuvants NOT be used after corn has reached the V8 stage. However, some offer this option on fully tasseled corn. Recent Agronomy Journal Publications have shown that beer can ears may form as a result of adjuvants applied near VT.
The drought has caused widespread deviations in tassel emergence, and timing of the application might have to wait until more tassels have emerged. Limited University data exists with the response to crops under severe drought stress. Many growers may be tempted to add additional products to the tank while going over the field. Most labels allow for the inclusion of insecticides, but caution that growers only apply approved tank mixes and observe the most restrictive labeling.
Finally, on some products there is a 30 day harvest restriction for forage and grain so bare this in mind if the drought continues. Early forage harvest might need to be delayed should an application be made. This is not a straight forward recommendation on corn and growers should look at each field and best determine its needs. Right now, rain would really make the most difference in preserving potential yield! For more information.