Weed Management

How Temperature and Rain Can Affect Burndown Herbicides April 18, 2018

Finding a good time for burndown herbicide applications has been a little tricky this spring, given the below-normal temperatures the first half of April and intermittent snow and rain, all of which can decrease herbicide efficacy. Checking the forecast can help identify an optimal window for application.

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Market Journal on Importance of Following Dicamba Labels April 6, 2018

This week on Market Journal Greg Kruger, Nebraska extension weed science and application technology specialist, discusses the importance of reading, studying, and following dicamba product labels.

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Figure 1. A ragweed plant rises above neighboring soybean. Researchers believe ragweed caused reduced soybean yields in this study by competing for sunlight. (Photo by Ethann Barnes)
Figure 1. A ragweed plant rises above neighboring soybean. Researchers believe ragweed caused reduced soybean yields in this study by competing for sunlight. (Photo by Ethann Barnes)

University Research: Ragweed Can Pose a Serious Threat to Soybean Yield March 30, 2018

Once thought to be an innocent bystander to field crop production, common ragweed can "drastically reduce soybean yields," according to University of Nebraska-Lincoln research. In dense populations, the loss was shown to be 40-76%.

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Glyphosate-resistant common waterhemp in soybean without a pre-emergence herbicide with multiple sites of action.
Glyphosate-resistant common waterhemp in soybean without a pre-emergence herbicide with multiple sites of action.

Pre-emergence Residual Herbicides are the Foundation of Soybean Weed Control March 29, 2018

Even with new dicamba-resistant soybeans, pre-emergence, residual herbicides are needed to mitigate yield loss due to weed competition, provide a longer time for soybean to establish, and reduce selection pressure for weeds resistant to post-emergence herbicides.

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Figure 1. Sulphur cinquefoil flower (Photos by Gary Stone)
Figure 1. Sulphur cinquefoil flower (Photos by Gary Stone)

Sulphur Cinquefoil — An Invasive Species in Nebraska March 16, 2018

Sulphur cinquefoil is a perennial forb and aggressive invasive species that establishes quickly in disturbed areas and over-grazed sites. Prevention and, if necessary, timely identification and management are the best routes to containing this invader.

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Figure 1. Uncontrolled blue mustard in a thin stand of winter wheat. (Photos by Robert Klein)
Figure 1. Uncontrolled blue mustard in a thin stand of winter wheat. (Photos by Robert Klein)

Controlling Weeds in and Fertilizing Winter Wheat, Particularly Late-Seeded Fields March 15, 2018

With many wheat fields planted later than normal due to rain, stands are not as competitive with weeds and younger plants may be susceptible to herbicide injury, making a good weed management plan even more important this year.

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Field pennycress

Dormant Spraying for Alfalfa Weeds March 2, 2018

With temperatures beginning to warm up, now is a good time to manage weeds such as field pennycress, downy brome, mustards, cheatgrass, and shepherd's purse in dormant alfalfa without risking plant injury.

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Marestail seedling

In the News March 1, 2018

Nebraska Extension specialists in the ag media discussing challenges of early season weed control, the good and the bad of cover crop insects, irrigated wheat production, and improving use efficiency of applied organic nitrogen.

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