Weed Management

Section of the Herbicide Classification Chart
Section of the Herbicide Classification Chart

2017 Chart for Selection of Herbicides Based on Site of Action

February 2, 2017
Management of glyphosate-resistant weeds is now the greatest challenge for Nebraska crop producers and land managers. The 2017 Herbicide Classification Chart from Take Action Against Weeds is an easy means for identifying herbicide site of action to avoid repeated use of the same action on the same field.

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sunflower herbicide efficacy table

Using Herbicide Prices and Efficacy Ratings to Select for Top Value

January 17, 2017
Take time this winter to strategize your weed management plan. Use Nebraska Extension resources to study herbicide efficacy, mode and site of action, and approximate costs to select products likely to provide the most value in weed control.

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Photos of pigweed species
Figure 1. Common pigweed species found in the Nebraska Panhandle. Palmer amaranth and waterhemp are ALS-resistant. Images, from top to bottom in each column, are of seed, seedlings, and plants in the vegetative growth stage. (Source Nebraska Extension EC94-138)

Management of ALS-Resistant Palmer Amaranth and Waterhemp in the Panhandle

January 6, 2017
Palmer amaranth and waterhemp in the Panhandle are resistant to ALS-inhibiting herbicides. While control of these weeds in dry bean can be challenging, corn, irrigated small grains, and sugarbeet make good rotation options for control. A combined pre/post treatment strategy controls weeds in the early part of the season when crop yield is most impacted and weed species are most susceptible to control inputs.

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Horseweed plant stages
Figure 1. (Top left) Newly emerged horseweed seedlings in the cotyledon stage. (Bottom left) Seedling in the rosette stage with true leaves formed. (Right) Horseweed plants that are early in the bolting stage.

Nebraska Extension Pest of The Month: Horseweed

January 5, 2017

Horseweed (marestail, Conyza canadensis L.) is a unique weed species that can emerge in both fall and spring. In Nebraska, unlike the eastern Corn Belt, horseweed populations predominantly emerge in fall as a winter annual.

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UNL greenhouse trial of glyphosate resistance in kochia
kochia in the greenhouse

Managing Glyphosate- and ALS-Resistant Kochia in the Panhandle

December 15, 2016
The development and management of pesticide-resistant kochia in dryland and irrigated systems in the Panhandle including a table of herbicide options for Nebraska.

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Field trial with Roundup Ready 2 Xtend soybeans and a pre and post herbicide application.

Understanding the Roundup Ready 2 Xtend™ Soybean Weed Management System

November 11, 2016
A new soybean cultivar with dicamba-tolerant Roundup Ready 2 Xtend™ soybean is expected to be planted on over 15 million acres in 2017, offering an additional means of managing herbicide-resistant weeds. The weed management system, which was tested the last four years in Nebraska trials, provides for use of Roundup Xtend™ of XtendiMax™ (dicamba).

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CW Q&A
CW Q&A

Q&A: Which formulation of 2,4-D is preferred for fall application?

November 4, 2016
Answers to three grower questions on fall herbicide application in row crops.

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EPA Re-Affirms Enlist Duo for GE Crops and Proposes Amended Registration

November 1, 2016

Enlist Duo containing the choline salt of 2,4-D and glyphosate was first registered in 2014 for use in genetically engineered corn and soybean in select states, including Nebraska.  After granting the registration, EPA learned that the registrant had made claims of synergy between the ingredients in the herbicide’s formula that had not been shared with EPA at the time of registration.

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