All posts by Larry Steckel, Extension Weed Specialist

2019 Xtend Weed Management in Tennessee: We have a Problem

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A year ago this month I posted a blog that was titled “Dicamba in Tennessee: Year 3”.  At that time the Tennessee Department of Agriculture had fielded 45 official dicamba drift complaints.   There were some issues on poor grass control but overall weed control was good. So, what is the status of Xtend weed management in 2019? Continue reading


Control Options for Prickly Sida that has Escaped Engenia or XtendiMax and Glyphosate

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Prickly Sida and Palmer amaranth escaping 22 oz of XtendiMax and 32 oz Roundup PM picture taken 28 DAA

There have been a good number of calls reporting poor prickly sida (teaweed) control with Engenia or XtendiMax tankmixed with Roundup PM.  I have seen prickly sida escape dicamba tankmixed with glyphosate in some research here at the station as well.   This appears to have been a building problem as I recall similar, though fewer, calls last year.  The lack of prickly sida control in the Xtend system has been building a seed bank that is apparently showing up in many fields this year. Continue reading


New Tactics Needed in Managing Weeds in Xtend Crops

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Palmer amaranth recovering 20 days after 12.8 oz Engenia and 32 oz Roundup PM

After more questions this past week on follow-up applications to remove Palmer amaranth, junglerice and goosegrass in Xtend crops it occurred to me we need a new thought process on weed management  with this technology. Roundup Ready soybeans came out in 1996 and cotton in 1998.  If we look back at the first three years with that technology, glyphosate was controlling every weed no matter the weed height. That Roundup Ready performance in the early years is still the expectation with Xtend technology. It has become abundantly clear, in year three, that Engenia or XtendiMax mixed with glyphosate is not providing even close to the level of weed control that glyphosate alone did back in it’s hay day.  Continue reading


Control Options for Palmer Amaranth that has Escaped Engenia or XtendiMax

Palmer recovering from 22 oz/A of XtendiMax applied 30 days ago

A number of folks in the past few days have asked about the best way to take out the Palmer amaranth that has lived through an Engenia or XtendiMax application. The answer depends upon the crop and if there is still time on the label to try to respray a labeled dicamba product. Continue reading


Reports of Sketchy Palmer Amaranth Control with Engenia and XtendiMax

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There have been a good number of calls on sketchy Palmer amaranth control with a 12.8 oz/A of Engenia or 22 ozs/A of XtendiMax mixed with a quart/A of Roundup PowerMax. I visited a number of these fields last week and indeed anywhere from 14 to 20 days after application some Palmer amaranth were recovering. Continue reading


UT Weed Tour June 19

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Dear Colleagues,

The University of Tennessee Weed Tour will be held Wednesday, June 19 at the West Tennessee Research & Education Center in Jackson, TN (605 Airways Blvd).  Registration will start at 8:30 A.M. and the tour will begin at 9:00 A.M.  It will end about 11:30. We will have breakfast biscuits available before the tour starts. Continue reading