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Factors That Influence Effective Fungicide Spray Coverage

May 8, 2018
This agronomic image shows a soybean field.

With corn and soybean diseases showing up in most fields every season, it’s important to understand how to get the most out of your fungicide. Factors such as weather, application method and timing can effect fungicide spray coverage, which can affect the results.

Michigan State University Extension says spraying fungicides when there is a light breeze of 2 to 6 miles per hour is better than spraying in still conditions. With a light breeze, growers can see where the spray is landing and can adjust spray configurations accordingly. They also recommend spraying early in the morning when temperatures are low and humidity is high to help reduce fungicide evaporation.

Your fungicide application method can also impact effectiveness and yield potential. When comparing ground vs. aerial spray options, you should take growth stage into consideration.  While aerial application will add another expense, a study from Purdue University Extension found that in soybeans, sprayer wheel traffic from R1 through harvest can damage plants and reduce yield.

University of Illinois Extension highlights several advantages that come with aerial application including speed, lack of disturbance and damage to the crop as well as the ability to work when the ground is wet. A single aircraft can treat an average of 1,500 to 2,000 acres per day, and therefore ensure crops get sprayed in a more timely fashion. Aerial application also creates narrow spray droplets, which helps provide better coverage and canopy penetration at low spray application rates.

Whether applying via ground or air, Syngenta offers Trivapro® fungicide for harder-working, longer-lasting disease control for corn and soybeans. Trivapro protects soybeans from diseases like frogeye leaf spot, rusts, anthracnose brown spot and others. In corn, Trivapro protects against Southern and common rust, gray leaf spot and Northern corn leaf blight.

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