Resistance Management

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Insects

Weeds

UNL Weed Scientists on Weed Resistance

Although it has been getting more attention the last few years, the issue of herbicide resistant weeds is not new. In this video retired UNL weed scientist Alex Martin discusses some of the history of weed resistance and how we got to where we are today. Chris Proctor, a current UNL weed scientist, highlights some of the present-day issues with herbicide resistance management.

Both note the importance of diverse weed management techniques to slow the spread of herbicide resistance and the significance of thoughtful stewardship of our herbicide technologies to ensure their usefulness into the future.

Related Articles

Field with giant ragweed at early treatment stage

Considerations for Managing Herbicide-Resistant Weeds in Soybeans: Spring Burndown April 28, 2017

One of the challenges with spring burndown application is timing. Wet and windy conditions can delay spraying and under these conditions weeds can grow significantly in a few days. Waiting until planting to spray troublesome weeds such as marestail may be too late to achieve adequate control. In addition, waiting until soybean planting limits the available herbicide options since there are relatively few labeled effective burndown chemicals for spraying at this time. The following section identifies key treatment aspects to consider for several resistant varieties in Nebraska.

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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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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

As you begin developing your weed management plan for 2017, here are six key management practices and five key timings to improve control of herbicide-resistant weeds this year.

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western bean cutworm in corn
Figure 1. (left) Western bean cutworm causing feeding damage in corn. (Photo by Jim Kalisch and Silvana Paula-Moraes) (right) A green lacewing beneficial insect eating western bean cutworm eggs. (Photo by Julie Peterson)

Which Bt Traits Do You Need to Purchase? March 24, 2017

When it comes to buying corn seed, one way to save money can be to ensure that you don't invest in GMO insect protection traits that you do not need for your particular farm or field. Which corn rootworm, western bean cutworm, or European corn borer traits do you need? This article can help you determine which of the nine types of Bt proteins might best serve your needs.

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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 β€” common ragweed, common waterhemp, marestail, kochia, giant ragweed, and Palmer amaranth β€” have confirmed resistance to glyphosate. Rotate herbicide sites of action and weed control practice to avoid contributing to this trend.

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