Category Archives: Soybean

Heat and Crop Performance

The last week of June and the start of July have brought unusually dry conditions to much of West Tennessee, and we’re already seeing the effects on the region’s major row crops. Among crops cotton—often considered a heat-loving crop—may appear to be thriving right now, extended heat and limited rainfall can still influence how cotton and other major crops grow and develop as the season progresses.

Why this matters now

Dry weather at this point in the season can quickly shift from “manageable” to “yield-limiting,” especially if high temperature and evaporative demand rates continue and soil water remains low. A widespread, soaking rain in the coming weeks would help stabilize crop conditions and reduce stress during critical growth periods.

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Start Planning 2027 Weed Control NOW

Picture 1. Palmer amaranth escaping dicamba + glyphosate fb/dicamba + glyphosate

Another week and more reports and field visits to fields where Palmer amaranth is escaping glufosinate, glyphosate and dicamba.  These escapes range from relatively small pockets in fields to almost complete Palmer amaranth jail breaks across large portions of fields (Picture 1 and 2). Continue reading


Prickly Sida Management in Soybean and Cotton

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There have been a good number of reports of prickly sida issues in soybean and cotton fields.  Prickly sida or tea weed has increasingly become more of an issue in these crops.   There are two reasons for this.  First, the Group 15 herbicides (Dual Mag, Warrant, Zidua) are the most common PRE-applied herbicides utilized.  Though that group of herbicides provides good residual control of pigweed and grasses, it provides no help on sida.  Second, is that neither glyphosate nor dicamba has ever been very effective on this weed.  The only popular POST option that can give some control is Liberty.  However, even Liberty is limited to controlling only very small (<2”) prickly sida. Continue reading


Managing Dicamba and Glufosinate-Resistant Pigweed

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Palmer amaranth escaping dicamba + glyphosate

Reports of Palmer amaranth escaping dicamba and/or glufosinate have been common the last couple of days.  Based on our recent research this is not a surprise as we have field and greenhouse studies showing that some Tennessee populations cannot be controlled with either herbicide (Figure 1).
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Goosegrass Management

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The typical delayed planting spring did not occur this year. This is good news from a goosegrass management standpoint as it has cut down on the number of fields that crop scouts and producers find infested with large goosegrass.  We are all well versed that there are few good answers when goosegrass gets big. Continue reading


Volunteer Canola Control

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A common weed question recently is how to control volunteer canola in double crop soybean.  We do not have research on this “new” problem.  Fortunately, my colleague, Dr. Joe Ikley of North Dakota State University, has good information on what herbicides work best. His research indicates that auxin herbicides like 2,4-D are rated poor for control of volunteer canola.

Fomesafen (Prefix, Reflex, Flexstar, etc.) is rated as excellent on volunteer canola control. This provides growers with an option that is readily available, relatively inexpensive and can provide residual pigweed control.

Liberty is also rated very high on volunteer canola.  However, this will be incorrect if the volunteer canola is a Liberty Link variety.


UT Weed Tour Next Wednesday June 17

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JACKSON, Tenn. – The University of Tennessee Institute of Agriculture will host the annual Weed Tour June 17 at the West Tennessee AgResearch and Education Center. The guided tour will feature 40 weed management research tests in cotton, corn and soybean.

Weed Tour runs from 9 – 11:30 a.m., with registration opening at 8:30 a.m. A light breakfast will be served. Continue reading