Foliar fungicide applications can result in a significant yield advantage of up to 7 bushels per acre, according to DuPont Pioneer and University research trials. Particularly in corn on corn, no-till and strip till situations, along with later-maturing fields, the yield advantage can be substantial when a foliar fungicide is used.

DuPont Pioneer experts suggest that farmers consider the following factors when planning an application of foliar fungicide.

  1. Previous Crop: Many foliar pathogens survive in corn residue. The risk of foliar diseases, such as gray leaf spot and northern leaf blight, increases in corn on corn.
  2. Weather Conditions: Rainy and/or humid weather is most favorable to foliar diseases. In growing seasons when these conditions prevail, the risk for disease development is greater.
  3. History of Disease: Some field locations may have a history of greater foliar disease severity. Fields in river bottoms, low areas or surrounded by trees may be more prone to foliar corn diseases.
  4. Hybrid Resistance: If the disease resistance rating is a 6 or greater, a fungicide application may not provide a yield benefit. For susceptible products with disease rating less than 4, spray if disease symptoms are present on the third leaf below the ear or above on 50% of the plants examined. For intermediate products with disease rating of 5, determine if disease symptoms are present on the third leaf below the ear or above on 50% of the plants examined.

The original release from DuPont Pioneer can be found here.

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