Weed Management

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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Figure 1. Marestail seedling growing in a no-till field. Due to its small size in the fall, pay special attention during scouting, especially in no-till fields where residue can hide seedlings.during scouting.
Figure 1. Marestail seedling growing in a no-till field. Due to its small size in the fall, pay special attention during scouting, especially in no-till fields where residue can hide seedlings.

Fall is Optimal for Marestail Management October 28, 2016

With corn and soybean harvest nearing completion in Nebraska this is a great time to begin scouting fields for winter annual weeds like marestail. Timing is critical to successful control of marestail, especially in no-till soybeans as many populations have evolved resistance to glyphosate and ALS-inhibiting herbicides.

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Figure 2. Cheatgrass seed heads (or panicles) as they mature. The panicles on the left are shattering, the second on the left is mature but not shattering, the two on the right are immature.
Figure 2. Cheatgrass seed heads (or panicles) as they mature. The panicles on the left are shattering, the second on the left is mature but not shattering, the two on the right are immature.

Nebraska Extension Pest of the Month: Cheatgrass October 17, 2016

The winter annual weed species cheatgrass is competitive with crops, desirable forage, and native plants and will reduce productivity of crop and range land. Learn how grazing, mowing, and properly timed herbicide application can be integrated to provide effective control.

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Fall Management of Cool-Season Invaders in Pastures October 12, 2016

When cheatgrass, bromes, and other cool-season plants invade native warm-season grass pastures and rangeland, they shift good grazing away from summer.

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