How to identify Sudden Death Syndrome (SDS) in Soybean
How to identify Sudden Death Syndrome (SDS) in Soybean
Length: 00:02:01 | Adriana Murillo-Williams, Paul D. Esker
The correct identification of soybean diseases is the number one step when developing an integrated disease management plan. Many stem and root diseases can be observed during early and late reproductive stages in soybean. Most of these diseases will lead to symptoms such as leaf wilting, stem rot, and root rot, and are difficult to tell apart without a close examination of plants. The fungus Fusarium virguliforme causes the disease known as Sudden Death Syndrome (SDS). Symptoms caused by SDS can be confused with those cause by other stem diseases during reproductive stages. Some key symptoms and signs that differentiate SDS from other stem diseases are presented in this video.
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- [Paul] There are a number of stem diseases that affect soybean.
The pathogen that cause stem diseases infect plants early in the season and symptoms become visible during late reproductive stages of the crop.
Here is how you can identify SDS.
In the field, look for uneven spots.
As symptoms progress, these spots will look yellow and brown.
Collect plants and examine the leaves, the crown, and the roots.
Foliar symptoms of SDS start as random yellow spots that develop into a general yellowing and necrosis between the veins.
Dry leaflets will detach from the petioles, leaving the appearance of deer feeding.
If plants are affected by other stem diseases, like white mold and stem canker, leaflets will remain attached to the petioles.
Sometimes you can see a blue to purple fungal growth near the crown in addition to root rot.
Use a knife to expose the cortex of the stem near the base of the plant.
Plants with SDS we'll have a tan discoloration.
However, the inner part of the stem, or the pith, will remain white.
This is a way to distinguish SDS from brown stem rot, which causes a dark brown discoloration of the pith.
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