Four Strategies to Fend Off Last Season’s Soybean Diseases

soybean crop
Last year’s diseases can overwinter in the soil and pose a threat to this year’s soybean crop.

Overwintering disease pathogens can be the undoing of this season’s crop.

But with careful observation, planning and prevention, growers can greatly reduce disease impact and maintain yield and quality.

Disease prevention begins long before planting. “The first step in disease prevention is knowing the disease history of the field,” said Randy Myers, fungicides product development manager at Bayer. “Identifying and recording each season’s diseases is one of the most effective tools for planning to proactively manage disease in the upcoming growing season.”

Scout your fields throughout each season to look for disease and take notes about or pictures of the diseases present. Some diseases seem to share visible symptoms and may be difficult to differentiate and diagnose. Consult with an agronomist or extension agent to better understand the signs and accurately identify diseases present in your field. Accurate identification is the key to managing disease in the current growing season and preventing disease in future growing seasons.


Plan to proactively prevent disease

Use these following proactive strategies to prevent the return of yield-robbing diseases year over year:

  1. Rotate crops
    Rotating to a non-host crop reduces the proliferation of disease pathogens. Once all the host debris has completely decayed, the pathogens will die off, weakening last season’s disease threats before the host crop is planted in the field in a future growing season.
  2. Plant a disease-resistant variety
    Select a soybean variety that is resistant to diseases commonly found in your fields, but caution that no soybean variety is resistant to all diseases. For added disease prevention, choose a fungicide that complements your selected variety to prevent disease before it begins.
  3. Apply a fungicide
    “Using a fungicide with strobilurin and triazole components is a great way to prevent disease in your fields,” said Myers. “Fungicide use can also improve plant health and could ultimately result in an increase in yield and profit.”
  4. Till after harvest
    Where tillage is core to the agronomic practices, tilling fields after harvest may reduce disease pressure the following season by burying crop residue, hastening degradation and reducing pathogen survival.

Bayer solutions for disease control

Myers recommends using Stratego® YLD fungicide for sustainable, long-lasting disease protection. With two modes of action, it provides both preventive and curative activities and systemic movement for broad-spectrum disease control. In soybeans, Stratego YLD works to prevent and manage diseases such as brown spot and frogeye leaf spot. As part of an integrated disease management program, Stratego YLD can be a critical solution to help fend off last season’s yield-robbing diseases.  



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