Amit Jhala - Extension Weed Management Specialist

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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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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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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Weeds in corn
Figure 1. A wet soybean field in south-central Nebraska. A pre-emergence herbicide was applied but due to continued excessive rainfall, the herbicide was washed away and weeds have started emerging.

Effect of Excessive Rainfall on Efficacy of Residual Herbicides Applied in Corn and Soybean May 23, 2017

How excessive rainfall may affect the efficacy of residual herbicides is complex and influenced by multiple properties of the soil and the herbicide applied.

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Photos of the Palmer amaranth and common waterhemp plants at cotyledon stage
(Left) Figure 1. Palmer amaranth cotyledons: long and narrow (Photos by Alfred Stark and Lowell Sandell) (Right) Figure 2. Common waterhemp cotyledons.

How to Differentiate Common Waterhemp and Palmer Amaranth Seedlings May 16, 2017

Growers should be on the lookout for common waterhemp and Palmer amaranth, which typically start emerging in the first or second week of May in Nebraska.

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Palmer amaranth
Figure 1. This female Palmer amaranth plant can produce up to 0.5 million seeds.

Watch for Palmer Amaranth in Conservation Reserve Program (CRP) Fields May 12, 2017

Palmer amaranth has not been confirmed in conservation plantings in Nebraska; however, the identification and occurrence of Palmer amaranth in CRP fields in Iowa has raised concerns among weed scientists and growers about its spread into conservation plantings in Nebraska and offer some suggestions for growers.

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Spraying the New Phenoxy Herbicide Formulations in Xtend and Enlist Soybeans Will Present Challenges May 11, 2017

The new phenoxy herbicide formulations, including Enlist Duo™ (Dow), XtendiMax® (Monsanto), Engenia™ (BASF), and FeXapan™ (DuPont), offer growers new management options along with new application requirements. To alleviate problems related to applying new phenoxy herbicide formulations in soybeans as well as to increase herbicide performance, manufacturers have established application requirements. Here we discuss some of the key application factors to consider.

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soybean seedling

Timing is Critical with Pre-Emergence Flumioxazin-Based Herbicides in Soybeans April 26, 2017

Soybean planting has started in Nebraska and it’s time to apply pre-emergence herbicides. Six weeds have evolved resistance to glyphosate in Nebraska. The best way to effectively control resistant and other hard-to-control weeds is by applying residual, pre-emergence herbicides with multiple effective modes of action. Several new herbicides recently registered in soybean are in this category and could be considered.

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