Weed Management

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Weed Management, Cover Crops Field Day June 28

May 26, 2017
View the latest weed management technologies and cover crop demonstrations during this field day at the South Central Ag Lab near Clay Center.

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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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Amit Jhala (left) and Debalin Sarangi
Amit Jhala (left) and Debalin Sarangi (right) along with other scientists detected pollen-mediated gene flow from glyphosate-resistant common waterhemp in Nebraska.

New Research Quantifies the Dispersal of Glyphosate Resistance Trait Through Pollen-Mediated Gene Flow

May 18, 2017
The pollen-mediated gene flow was detected 38% to 54% at 0.1 meter distance and 5% to 9% at 50 meters, the highest distance tested in this study.

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Absinth wormwood leaf
Figure 1. Absinth wormwood leaf (Photo by Kristi Paul)

Absinth Wormwood - New Invasive Species in Nebraska Panhandle

May 17, 2017
An invasive species, absinth wormwood will establish quickly in disturbed areas and over-grazed sites and can out-compete desirable forbs and grasses in pastures and rangeland, reducing biodiversity.

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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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