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Farms.com Home  › Expert Commentary

Green Stem Syndrome Is Showing Up In Mature Soybean Fields In Southwest Missouri

Nov 28, 2016
By Jill Scheidt
Agronomy specialist 
 
Jill Scheidt, agronomy specialist with University of Missouri Extension, is reporting seeing a lot of fields in southwest Missouri with green stem syndrome.
 
“Normally, when a soybean plant matures, it drops its leaves and stems lose their green color. Soybean plants affected by green stem syndrome will not dry down properly, and seed may mature before the stem turns brown,” said Scheidt.
 
The cause of green stem syndrome is unknown but attributed to many different causes like viruses, low soil moisture, potassium deficiency, soybean population density, genetic mutations in soybean plants and insect damage.
 
Reduced pod number during the full seed stage is an associated cause because carbohydrates and nitrogen remain in the stem and roots and appear to have a role in retention of green stems.
 
“There were above threshold levels of green stinkbug this year,” said Scheidt.
 
When green stem syndrome is triggered by green stink bug feeding, management of the insect may be helpful. Treatments must be applied when leaves and pods are green and feeding is taking place.
 
“When green stem syndrome results from viral infection, management is difficult. Managing viruses usually requires controlling the vector of the virus,” said Scheidt.
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