Delayed Senescence in Soybean
Delayed senescence affects soybean plants at the end of the season, slowing harvest and causing issues with the combine. Green stem disorder is when soybean stems stay moist and green, while pods mature as usual. Symptoms may occur on single plants or in patches. Soybean plants with a reduced number of pods may stay green, yellow, or turn purple. If an entire soybean plant fails to mature at the appropriate time, it is known as green soybean syndrome. A temporary greening effect of whole plants may occur in response to pesticide application.
Soybean green stem disorder.
Adam Sisson
Soybean plants remaining green in response to artificial lighting.
Daren Mueller
A research-proven cause of green stem is a result of a soybean plant that has the genetic capacity to produce a greater pod load than has been realized; therefore, the carbohydrates remain in the stem as there is no available sink. Weather factors, such as drought or excess moisture, can lead to these limitations in pod load. Specific fungicide classes have been linked to increased delayed senescence, as well as viruses, insect injury, and artificial lighting. Varieties vary in their susceptibility to this disorder.
Prepared and reviewed by the Science for Success team and the Integrated Pest Management Program at Iowa State University.
Soybean green stem disorder.
Soybean plants remaining green in response to artificial lighting.
Soybean green stem disorder.
Soybean green stem disorder.
Delayed senescence in soybean.
Soybean green stem disorder.
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