Editor’s note: The following was written by Nathan Kleczewski, University of Illinois research assistant professor, for the university’s crop development Bulletin.
Corn producers in parts of the state are nearing the point in time where they are thinking about fungicide applications to their fields. A single fungicide application at the VT/R1 growth stage has the greatest chance of providing the producer with a return on their investment.
Nobody knows your farm history and yields better than you do. That is why running the numbers yourself and thinking about your past experiences can help you determine how likely you are to break even or make a profit using various programs under your specific situation.
To calculate how much yield needs to be protected to break even at a given application cost (fungicide cost plus application costs) and commodity price, use the formula:
Yield protected (bu/acre) = application cost ($/acre) / corn price ($/bu).
This formula can be used to help you determine the amount of protected yield and commodity price needed to break even and see a return on your investment.
For example, to see how much yield would need to be protected by a fungicide to pay for the cost of a $26/acre total application at a $4.50 per bu. grain price:
yield protected = ($26.00 per acre )/ ($4.50 per bu.) = 5.8 bu./acre
Or the same situation but a program that costs $30 per acre = ($30.00 per acre) / ($4.50 per bu.) = 6.7 bu. per acre
Knowing this information can be very useful in selecting fungicide programs for your specific fields.