Weed Management

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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Postemergence Weed Control in Alfalfa

April 21, 2017

Are you finding weeds in your new alfalfa?  Vigorous weed growth this spring may make it extra tough for your seedlings as weeds reduce growth of new alfalfa by shading and competing for moisture. 

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Field of soybeans
Figure 1. If a fomesafen-based herbicide (Flexstar/ Flexstar GT/ Marvel/Rumble) was applied in soybean in 2016, maintain 10 months of planting interval to corn this year.

Planting Interval of Corn after Previous Year's Soybean Herbicides

April 21, 2017
Corn-soybean is the most common cropping system in eastern Nebraska. While corn growers are getting ready for planting this season, it is important to pay attention to the planting interval of herbicides applied the previous year in soybean. Certain soybean herbicides have relatively longer planting intervals for corn, especially if they are applied post-emergence in soybean. This is particularly important because soybean planting was late last year in much of Nebraska due to May rains. This caused postemergence herbicides to be applied later in the season than they might normally be, making it important that you pay attention to the planting interval.

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Center pivot irrigated soybeans
Management in a successful soybean-after-soybean cropping system may require growers to make some slight adjustments in their practices, including irrigation, seed selection, and pest management.

Planting Soybean after Soybean (Part 2): In-Season Management Considerations

April 13, 2017

In Part 1 of this article, we look at considerations for planting soybean after soybean. In this article, Part 2, we share considerations for in-season management.

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Uuncontrolled giant ragweed

Planting Interval of Corn and Soybean after 2,4-D/ Dicamba Burndown Application

April 7, 2017
With cold, wet conditions in March, many producers may be facing a smaller than expected window for making their herbicide burndown applications in April. This makes timely applications now even more important to provide for a proper interval before planting this year.

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Photo comparison of 2 flelds with and without residual herbicide
Figure 1. The benefit of a residual herbicide can be clearly seen in these photos of fields with and without residual six weeks after planting. (Photos by Rodrigo Werle)

Keys to Managing Herbicide Resistance in Soybeans

April 6, 2017
Are last year's weed escapes still haunting you? Applying these six key management practices and five key timings can help you improve control of herbicide-resistant weeds this year.

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Ventenata plants
Ventenata / North African Grass seed heads, Ventenata dubia (Leers) Coss. Photo credit: ©Prof Matt Lavin-2008/Bozeman, Montana, USA - CC BY-SA 2.0

Watching for Ventenata — an Invasive Weed on our Western Horizon

April 5, 2017
Ventenata is an invasive grass in Wyoming that is slowly spreading east. If it does migrate to Nebraska, early detection and rapid response will be essential in controlling its establishment. If it were to become established in the Pine Ridge area or Sandhills, it could devastate the ecology and range production.

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marestail

Status of Herbicide-Resistant Weeds in Nebraska

March 20, 2017
Nine weed species in Nebraska have now evolved resistance to at least one group of herbicides. Six weed species — common ragweed, common waterhemp, marestail, kochia, giant ragweed, and Palmer amaranth — have confirmed resistance to glyphosate. Rotate herbicide sites of action and weed control practice to avoid contributing to this trend.

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