Be aware of "green stem" disorder in soybeans
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.
Byamukama explained 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 said.
The green stems cause problems at harvest by clogging the thrasher on the combine. Byamukama said 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," he said.
What causes green stem?
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 said.
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 said 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.
Self-contained hydraulic system with power cables (hydraulic). Tandem Henschen axles (hydraulic). Hydraulic fenders. Manual or hydraulic tilt. 6,500-gallon tank.
- Dry weather, biofuel mandate to boost palm prices in 2014
- 2014 Farm Bill: Reallocating base acreage
- FAS administrator talks world ag export situation
- The Beige Book is out. The agriculture picture is not rosy
- New precision potassium fertilizer from AgroLiquid
- Ag markets ended the week in decidedly mixed fashion
- Are you in favor of a federal labeling standard for food that might contain genetically modified ingredients?
- Commentary: Barking up the wrong tree
- Water allocation for most drought-stricken Calif. farms to end
- Larson Electronics offers 150 Watt LED high bay light fixture
- Growth Points: Big data is about to get even bigger
- Update on the world’s 15 largest seed banks
Ranco Bucket Elevators
Ranco Fertiservice Inc.