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Soybean fungicide seed treatment efficacy

Planting intentions and variety selections for 2020 were likely made several months ago in 2019. Perhaps the decision about whether or not to get your seed selections treated with a seed treatment have not.  Unlike in the dent corn world, where it is a difficult task to find untreated seed to purchase, there are more seed treatment options to consider for soybean.

Making a fungicide seed treatment decision depends upon from which pathogen(s) you are trying to protect your soybean seeds and seedlings. Some soybean seed treatment fungicide active ingredients have efficacy against true fungi like Rhizoctonia solani, Fusarium species and Phomopsis species while others have activity against water molds like the Pythium species and Phytophthora sojae. To complicate matters a bit more, not all seed treatment fungicides that have efficacy against Fusarium species, are effective against Fusarium virguliforme, the pathogen that causes sudden death syndrome.

To aid folks making fungicide seed treatment decisions, Extension soybean plant pathologists from the north central states have combined their seed treatment efficacy data into a document titled "Fungicide Efficacy for Control of Soybean Seedling Diseases".  In this document they provide efficacy ratings for different fungicide active ingredients against different seed and seedling pathogens.

You can find this document among the resources available at the Crop Protection Network website,, or directly here.

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