Marestail rosette (Photo by Gary Stone)
Photo 1. Marestail / horseweed pre-bolt stage. (Photo by Gary Stone)

Act Soon to Manage Invasive Marestail in Pastures March 27, 2019

A description of marestail's history as an invasive weed in pastures and its management. Herbicide applications for marestail in pastures and rangeland may be most effective if applied in very early spring from April through early May.

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Figure 1. Marestail emerging relatively early this year in Nebraska due to plenty of moisture (Photo by Amit Jhala)

Management of Glyphosate-Resistant Marestail in Fall October 25, 2018

For successful marestail management in the fall, apply herbicides after harvest while weather conditions remain favorable (air temperature above 50°F). Effective control now may negate the need for an early spring burndown application.

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Marestail seedlings
Figure 1. Due to plenty of soil moisture this fall, marestail emergence was relatively early and over a longer period, leading to variable sizes of marestail plants that needed to be controlled before planting winter wheat. (Photos by Amit Jhala)

Q&A: How Can I Control Winter Annuals Now Before Planting Wheat? October 24, 2018

What is your herbicide recommendation for someone who wants to plant wheat, but has a lot of winter annuals coming up, including marestail?

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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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field pennycress post herbicide app
Figure 1. Survival of field pennycress due to application of burndown herbicide when the temperature was below 40°F for an extended time. (Photos by Amit Jhala)

Low Temperature and Frost May Affect Efficacy of Burndown Herbicides November 9, 2017

In many areas fall herbicide applications were delayed due to the late harvest. Applications can still be effective, depending on weeds present, temperature, rate of herbicide and additives used. The article offers recommendations for these late-fall applications and their importance, particularly for control of herbicide-resistant marestail.

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Market Journal title

Market Journal on Nitrate Leaching, Marestail Control and More June 9, 2017

On this week's Market Journal with host Jeff Wilkerson view these segments:

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Glyphosate-resistant marestail

Postemergence (Rescue) Herbicide Options for Control of Glyphosate-Resistant Marestail in Corn and Soybean May 24, 2017

Several factors have contributed to delayed applications and marestail escapes this spring. Includes recommendations for timely postemergence control in corn and soybean.

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Marestail seedling and field infested with marestail
Figures 1 (inset). Marestail plant forming rosette in spring. Figure 2. Corn field infested with glyphosate-resistant marestail in eastern Nebraska. (All photos by Debalin Sarangi).

When is a Good Time to Scout and Control Glyphosate-Resistant Marestail? March 8, 2017

Marestail, also known as horseweed or Canada fleabane, is a winter or summer annual weed in Nebraska. Historically, marestail was found in waste area, field edges, along roadsides, and railway tracks; however, no-till crop production systems over the last 20 years favor marestail germination and establishment in agronomic crops in Nebraska.

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