Weed Management

Cottonwoods
Figure 1. Cottonwood infestation in sub-irrigated meadow. This photo was taken during the period of high water table in early spring. (Photo by Stevan Knezevic)

Research Findings on Chemical Control of Cottonwood May 22, 2018

Cottonwood offers many benefits, but also can be an invasive and difficult-to-control weed. Nebraska researchers studied control efficacy of eight herbicides over two years and found three products provided total control more than a year; however, they also noted a caution for areas with high water tables.

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Field trial comparing timing of soybean weed management
Figure 1. (left) Soybean without preemergence herbicide at V6 stage and (right) soybean with preemergence herbicide at V6 stage.

Preemergence Herbicides Delayed the Critical Time for Weed Removal in Soybean May 16, 2018

Researchers tested two herbicide strategies in soybean to see how preemergence herbicides would delay the critical time of weed removal, likely reducing the number of herbicide applications needed in a season.

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Field of cover crops

Q&A on Spring Herbicides and Fall Cover Crop Plantings May 14, 2018

Grower question: Can I use a herbicide like Callisto, with mesotrione as its active ingredient, now and plant radishes and turnips for a cover crop in early September?

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Field photos of the three herbicide treatments tested.
Figure 1. Three herbicide treatments were applied to determine whether a pre-emergence herbicide affected the critical period of weed control. From left, the plots show: 1) Corn at V12 that had not received a pre-emergence herbicide; 2) corn at V12 that received an atrazine treatment; corn at V12 that received an Acuron treatment

Preemergence Herbicides Influence the Critical Period for Weed Removal in Roundup Ready Corn May 11, 2018

Researchers tested three preemergence herbicide strategies in Roundup-Ready Corn to identify how their application affected the critical period of weed control — the period when weed control is essential to avoid yield loss.

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Postemergence Weed Control in Alfalfa May 9, 2018

New alfalfa seedlings do not compete well with weeds and are best managed when small. Here are management tips for when you mow or use chemical control measures.

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Marestail rosette

Residual Herbicides Best Suited to Spring Marestail Management May 2, 2018

Marestail, also called horseweed, is sensitive to most herbicides labeled for its control early in its growth stage, i.e. the rosette stage. Delaying treatment can allow it to compete with corn and soybean, potentially causing significant yield reduction.

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Broadleaf weeds

Q&A: Which Dicamba Product Should I Use to Kill Broadleaf Cover Crops or Burndown Weeds Before Xtend Soybean? April 27, 2018

With a delayed or compressed planting season, this week several growers asked whether they could immediately plant soybeans after a dicamba application. See how Extension Weed Scientist Amit Jhala replied.

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Cereal rye in corn stubble
Figure 1. Cereal rye planted as a cover crop in many fields is slow-growing this spring. Combining a cover crop termination and PRE application may be a valuable time-saver this year, if used correctly.

Q&A on Terminating Cereal Rye, Applying a PRE April 25, 2018

A grower asked: My cereal rye cover crop is only 3 to 5 inches tall going into planting season. Can I combine two field operations in one by applying glyphosate to terminate cereal rye and tank-mixing it with a residual herbicide for early season weed control?

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