Weed Management

Palmer amaranth in corn
Figure 1. Glyphosate-resistant Palmer amaranth infesting corn field in south central Nebraska. (Photos by Amit Jhala)

Grower Q&A: Is this Herbicide-Resistant Palmer Amaranth? June 23, 2017

This week growers facing challenges with Palmer amaranth questioned whether it was due to the product, the environment and lack of rain, or a resistant weed. Several factors could be at play, notes a UNL weed scientist, who recommends starting with preemergence herbicides with residual activity to get the best control.

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Weed escapes in soybean after preemergence application
Figure 1. A soybean field in south central Nebraska without preemergence herbicide application. Applying a well-timed postemergence herbicide will be the only control option. (Photos by Amit Jhala)

Consider Application Restrictions of Postemergence Herbicides Based on Soybean Growth Stage June 19, 2017

It's important to consider soybean growth stage and preharvest interval when applying postemergence herbicides to avoid potential crop injury. This article describes how to determine crop growth stage and includes a table of application restrictions for common postemergence herbicides.

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Jeff Wilkerson, host of Market Journal

Market Journal June 16: Grain Markets, Bacterial Leaf Streak, Forecast June 16, 2017

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

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Corn field with severe weed population
Figure 1. A corn field in south central Nebraska without preemergence herbicide application. Applying a well-timed postemergence herbicide will be the only control option. (Photos by Amit Jhala).

Consider Corn Growth Stage When Applying Postemergence Herbicides June 14, 2017

When applying postemergence herbicides, consider corn growth stage, weed species present, and crop and weed heights. The article includes how to determine corn growth stage, recommendations to avoid problems, and a table of application restrictions for common postemergence herbicides.

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Volunteer corn in a soybean field
Figure 1. Soybean field infested with volunteer corn in southcentral Nebraska.

Control of Glyphosate-Resistant Volunteer Corn in LibertyLink Soybean June 12, 2017

Controlling glyphosate-resistant volunteer corn is a major challenge in some soybean fields this year as preemergence herbicides aren't very effective. Postemergence herbicides will be critical to its management.

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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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Flooded corn plants

Herbicide Considerations When Replanting June 8, 2017

Due to May flooding from heavy spring rains, replanting of corn and soybean continues in eastern and southern Nebraska. Here are two factors to consider regarding herbicide use in replanting.

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Soybean seedling damage due to PPO-inhibitor herbicide

PPO-Inhibiting Herbicides and Soybean Seedling Injuries June 5, 2017

Cool, wet soil conditions in late April and May may have enhanced the potential for soybean injury from PPO-inhibiting herbicides. The author describes plant injury symptoms to look for when scouting young soybean seedlings.

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