Soybean Sudden Death Syndrome (SDS)

Prepare for SDS Early in the Season

According to University of Illinois research, the initial SDS infections that occur on the roots and crowns of young soybean plants occur as early as the seedling stage. Roots have a blue coloration when infected and subsequent Root rot affects seedling health.

Sudden Death Syndrome (SDS) is one of the top yield-robbing pests in soybeans. Over the last five years, average annual damage caused by SDS cost soybean growers more than 44 million bushels in lost yield, and the spread of the disease continues to climb. SDS has been documented in almost every state where soybeans are grown. And while reported losses often represent 20-30 percent of a crop, yields can be cut by more than 70 percent.

  • SDS strips soybeans of production potential. But proper early-season preparations can help alleviate possible late-season losses.
  • SDS is caused by the fungus Fusarium virguliforme, which spreads through soil movement from field to field. The fungus can survive and overwinter in crop residue.

Melissa Chu, ILeVO® product manager, urges growers to pay attention to the possibility of SDS in their field. Once SDS is in a field, it stays there, and it’s a disease growers have been fighting for decades. Studies at Southern Illinois University Carbondale confirmed greater soil compaction leads to higher levels of SDS.

  • Often SDS develops in cool, wet weather and in compacted soil.
  • More moisture for longer periods of time in the soil enables the SDS pathogen to penetrate the soybean plant via the root system and put stress on the plant.

At flowering, the SDS fungus produces toxins that cause foliar destruction, including leaf drop and aborted pods. Plants may pull easily from the soil. Soybean stem tissue turns white, while areas between leaf veins turn bright yellow and then brown. The brown tissue may fall out and leave large holes in the leaves. Toxin production and symptom severity will vary by climatic conditions and the level of SDS resistance in the varieties grown.

Soybean Sudden Death Syndrome (SDS)
Distribution of SDS – North America

Sudden Death Syndrome Development Cycle

SDS Management

  • An integrated approach should be taken to manage and prevent SDS.
  • Though there are no seed varieties with the greatest resistance to SDS for fields with a history of the disease, and consider improving soil drainage in fields with recurring problems.

Partner your variety selection with ILeVO. The seed treatment has shown efficacy on SDS in university field trials. Daren Mueller, assistant professor at Iowa State University, says, “Having an integrated management approach with the addition of products such as ILeVO would provide a sound set of tools for growers to protect their crop when [variety] resistance may not be enough. We’ve tested ILeVO, and it appears to be a very effective product in preventing damage from SDS.”

ILeVO is unique in that it protects against both the foliar (above-ground) and root-rot (below-ground) phases of the disease, making it the most complete SDS protection available on the market. In addition, ILeVO provides broad-spectrum protection against all plant-parasitic nematode species in the seed zone, including Soybean Cyst Nematode (SCN), which, when present in a field, can exacerbate the SDS disease.

Field trials show yield are 2-10 bushels per acre higher when ILeVO is used, depending on pest severity. Including ILeVO and Poncho®/VOTiVO® as part of an Integrated Pest Management (IPM) program ensures soybeans perform better, even in high-risk areas.

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