Category Archives: Weeds

Reminder – Soybean Scout School This Week (7/17) in Dyersburg

UT’s Soybean Scout Schools will be held in July (see below). These field-side programs cover the basics of soybean growth, scouting, pest identification, and general management. Pesticide recertification and CCA CEU points will be available. Scout Schools are offered free of charge with sponsorship from the Tennessee Soybean Promotion Board. Registration is not required. Participants will receive a scouting notebook and a sweep net while supplies last. Continue reading

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

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

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New Tactics Needed in Managing Weeds in Xtend Crops

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

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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

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Weed Tour: June 19, 2019

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JACKSON, Tenn. – The University of Tennessee Institute of Agriculture will host the annual Weed Tour on Wednesday, June 19 at the West Tennessee AgResearch and Education Center. The guided tour will feature 60 weed management research tests in corn, soybean and cotton.

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

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REMINDER – UT Cotton Scout School (Friday, May 31, 2019)

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The UT Cotton Scout School is scheduled for the last Friday of the month, May 31st, at the West Tennessee Research and Education Center (605 Airways Blvd, Jackson). There is no fee, and preregistration is not required. Registration begins at 8:00 AM with the program starting at 8:30. Content will include classroom and hands-on training with an optional ‘go-to-the-field session’ after a box lunch. Topics covered will include cotton development and identification and symptoms of insect pests, plant diseases, and weeds.

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