PMN Crop News Homepage   

Posted 31 August 2015. PMN Crop News.

Five Tips to Help You Prevent Fungicide Resistance

Source: United Soybean Board Press Release.

Chesterfield, Missouri (August 5, 2015)--Rain has been on the minds of many over the course of the past few months. Such a wet growing season has many farmers thinking a lot about various weather-related challenges, including late planting, increased weed pressure, decreased yields as well as how the markets will respond. Another challenge to add to the list is disease. Prolonged wet weather increases the odds that you’ll see fungal diseases in your fields, which could require fungicide applications.


What makes these diseases even more of a challenge is that the pathogens that cause some of the most common soybean diseases are developing resistance to the fungicides currently available. A webcast from the Plant Management Network offers assistance to help you protect your operation against fungicide resistance. Consider these five tips:

• Plant disease-free seed – Many diseases can be spread by seed-borne infections.

• Scout fields for potential problems – Identification of challenges before immediately taking action helps protect from chemical resistance.

• Apply fungicide only when necessary and at the appropriate stage of development, correct application rate and as part of tank- or pre-mixes with multiple modes of action. Automatic spray increases rate of resistance, so creating variation and identifying when they’re needed helps prevent resistance.

• Rotate crops – Certain diseases are more prone to affect one crop over another, and rotating crops helps to reduce risk of disease mutations.

• Rotate chemistry types – Using the same mode of action repeatedly speeds up resistance development.

Proactively protecting your operation against fungicide resistance is a great practice. One specific pathogen that concerns farmers in the South is Cercospora, which causes purple seed stain and Cercospora leaf blight diseases.

However, concerns over the development of resistance in Cercospora extends well beyond the South, says Trey Price, Ph.D., Assistant Professor at the Macon Ridge Research Center with the Louisiana State University Ag Center.

“Cercospora leaf blight and purple seed stain are economically important diseases throughout the United States,” he says. “Losses in the United States vary from year to year, but on average, about 5 million bushels are lost to this disease annually”.

The soy checkoff sponsors the “Focus on Soybean” webcasts through a partnership with the Plant Management Network that makes the videos free for U.S. soybean farmers to watch.