Be aware of "green stem" disorder in soybeans

decrease font size  Resize text   increase font size       Printer-friendly version of this article Printer-friendly version of this article

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.


Buyers Guide

Doyle Equipment Manufacturing Co.
Doyle Equipment Manufacturing prides themselves as being “The King of the Rotary’s” with their Direct Drive Rotary Blend Systems. With numerous setup possibilities and sizes, ranging from a  more...
A.J. Sackett Sons & Company
Sackett Blend Towers feature the H.I.M, High Intensity Mixer, the next generation of blending and coating technology which supports Precision Fertilizer Blending®. Its unique design allows  more...
R&R Manufacturing Inc.
The R&R Minuteman Blend System is the original proven performer. Fast, precise blending with a compact foot print. Significantly lower horsepower requirement. Low inload height with large  more...
Junge Control Inc.
Junge Control Inc. creates state-of-the-art product blending and measuring solutions that allow you to totally maximize operating efficiency with amazing accuracy and repeatability, superior  more...
Yargus Manufacturing
The flagship blending system for the Layco product line is the fully automated Layco DW System™. The advanced technology of the Layco DW (Declining Weight) system results in a blending  more...
Yargus Manufacturing
The LAYCOTE™ Automated Coating System provides a new level of coating accuracy for a stand-alone coating system or for coating (impregnating) in an automated blending system. The unique  more...
John Deere
The DN345 Drawn Dry Spreader can carry more than 12 tons of fertilizer and 17.5 tons of lime. Designed to operate at field speeds up to 20 MPH with full loads and the G4 spreader uniformly  more...
Force Unlimited
The Pro-Force is a multi-purpose spreader with a wider apron and steeper sides. Our Pro-Force has the most aggressive 30” spinner on the market, and is capable of spreading higher rates of  more...
BBI Spreaders
MagnaSpread 2 & MagnaSpread 3 — With BBI’s patented multi-bin technology, these spreaders operate multiple hoppers guided by independent, variable-rate technology. These models are built on  more...


Comments (0) Leave a comment 

Name
e-Mail (required)
Location

Comment:

characters left


Smooth Wall Grain Bins

Meridian’s SmoothWall bins are the ultimate storage bins, used to handle and store fertilizer, grain, feed and seed, and extend ... Read More

View all Products in this segment

View All Buyers Guides

Feedback Form
Feedback Form