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Early-Season Storms Leave Fields Ripe for White Mold

April 25, 2019
This agronomic image shows bleached soybean stems infected with white mold

If you’ve ever wrestled with soilborne disease in soybeans, you know that planting into cool, wet fields can be a dream for diseases like white mold, but a nightmare for your soybean yield.

The recent storms that have dumped rain and snow on the Midwest will likely leave fields soggy for quite some time and at higher risk for white mold development later in the season.

Plant pathologists at the University of Wisconsin Extension indicate white mold development goes hand in hand with high-yield environments that typically promote plant health:

  • Dense soybean canopies caused by narrow row spacing.
  • High seeding densities.
  • Early planting.
  • High soil fertility.

So, if any of the above factors describe your fields or if you’ve experienced white mold before, scouting should be at the top of your list for 2019.

When to scout for white mold:

As a refresher, you should scout just before flowering and when conditions are ripe for disease development. To help guide your scouting, researchers with the North Central Soybean Research Program (NCSRP) determined specific rainfall amounts and temperatures that should alert you to possible white mold development:

  • July rain between ¾ of an inch and 4.5’’.
  • Average July temperatures of less than 67° F.

If conditions are ripe for the development of white mold, a preventive fungicide treatment should be applied. We recommend Miravis® Neo fungicide, our latest broad-spectrum soybean fungicide with one of the highest-performing SDHI mode of action fungicides available, Adepidyn®, plus proven performers azoxystrobin and propiconazole. With both soilborne and foliar disease protection, Miravis Neo will help take the guesswork out of disease management for both white mold and foliar diseases.

The chart below shows how the improved spectrum from Miravis Neo delivers better white mold suppression, resulting in a greener, healthier crop.

This agronomic chart shows disease assessment between fungicides..

FAD050A3-2016; USNF0F1032016. Applications at R1 on July 12. Disease assessments on Sept. 2. University of Minnesota. Becker, MN

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