• Corn product yield responses to fungicide applied at the R1 growth stage varies. Understanding which corn products benefit most from a fungicide application can help guide management decisions by growers.

• This trial helped determine the magnitude of yield response of individual corn products.

• An early relative maturity (RM) (less than or equal to 103 RM) corn product replicated trial was established in Mason, Michigan, and a late RM (greater than 103 RM) corn product trial was established in Colon, Michigan. 

• Channel® brand corn products included in testing for Michigan were selected by Channel® Seedsmen.

• The trial in Mason was a split-plot design with three replications with corn product as the whole plot and fungicide as the sub-plot. This location was rainfed and did not receive irrigation. 

• The trial in Colon was an irrigated strip trial with a single replication.

• An application of Delaro® Complete Fungicide (10 oz/acre) was made on 7/13/21 in Mason and 7/14/21 in Colon at the R1 corn growth stage. A high-clearance sprayer with 20 gal/acre of water as carrier was used.

   

• Mason received below average rainfall until late-June, followed by near-normal rainfall for the remainder of the season.

• Moderately high tar spot pressure was present in Colon and moderate pressure in Mason. The heightened pressure is Colon could be explained by the presence of consistent irrigation moisture. 

• The average yield advantage to an application of Delaro® Complete Fungicide at R1 growth stage was 13 bu/acre.

• Fungicide applications tend to result in a yield increase; however, select corn products demonstrated a greater yield benefit from a fungicide application.

• Growers should first consider targeting corn products with the greatest response for fungicide applications.

   

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