The so called "green stem" disorder was seen in almost every soybean field scouted the first week in October according to Emmanuel Byamukama, SDSU Extension plant pathologist, who explains that the characteristics of this disorder include delayed senescence of stems and occasionally leaves. Plants with this disorder are randomly dispersed in the whole field without any particular pattern at the field edges or center of the field.

"Both cases of green stems without leaves still attached and green plants with leaves still green can be found in soybean fields around this time of the soybean growing season," he says.


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The green stems cause problems at soybean harvest by clogging the thrasher on the combine. Byamukama says that adjusting ground speed and increasing engine power can help in avoiding blockage of the thresher. However, he added that this action increases fuel consumption and harvest time.

"Another strategy of minimizing impact of green stem disorder is delayed harvesting until after hard frost to dry down all plants still green. However, delayed harvesting has its disadvantages including pod shattering and increased seed decay caused by fungal pathogens," Byamukama says.