Several factors have been thought to be causing this disorder including viruses, stink bugs, bean leaf beetles, fungicides, late herbicides and late planting/emergence.

"However, recent research data in the region has shown that viruses and insects are not the absolute cause of the green stem disorder because not all plants that had viruses or were fed on by various insects developed green stem disorder. It is possible that insects will be attracted to plants remaining green in the field increasing the chance to transmit viruses. Research on the exact cause of this phenomenon is still on-going," Byamukama says.

A most recent research study out of Illinois demonstrated that increased incidence of green stem disorder depended on fungicide application, application timing, location and cultivar used.

Byamukama says growers noticing increased number of plants with the green stem disorder in soybean should take records of cultivar planted and fungicide applied and time of application and change cultivars and timing of fungicide application the following season.

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