Chris Proctor - Weed Management Extension Educator

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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Cereal rye cover crop
Figure 1. No-till cereal rye cover crop planted on October 21, 2016 after corn harvest in North Platte. Cereal rye was drilled at 60 lb per acre on 7.5-inch row spacing. Photo taken April 10, 2017.

Terminating a Cereal Rye Cover Crop – Things to Consider April 13, 2017

Fall-planted cereal rye is increasingly used as a cover crop in corn and soybean cropping systems in Nebraska. The authors address control of cereal rye through herbicide and mechanical measures and include a USDA NRCS map of recommended termination deadlines.

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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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Horseweed plant stages
Figure 1. (Top left) Newly emerged horseweed seedlings in the cotyledon stage. (Bottom left) Seedling in the rosette stage with true leaves formed. (Right) Horseweed plants that are early in the bolting stage.

Nebraska Extension Pest of The Month: Horseweed January 5, 2017

Horseweed (marestail, Conyza canadensis L.) is a unique weed species that can emerge in both fall and spring. In Nebraska, unlike the eastern Corn Belt, horseweed populations predominantly emerge in fall as a winter annual.

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Chart showing corn yield as affected by planting date and hybrid maturity
Chart showing corn yield as affected by planting date and hybrid maturity

Finding the Balance Between Corn Yield and Cover Crop Biomass November 29, 2016

Cover crops can provide either ecosystem services or forage benefits but understanding how they fit in cropping systems is still limited. This study assessed the effects of planting date (early and late), plant population (low, average, and high) and corn maturity (80 to 115 days relative maturity) on corn yield.

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Figure 1. Marestail seedling growing in a no-till field. Due to its small size in the fall, pay special attention during scouting, especially in no-till fields where residue can hide seedlings.during scouting.
Figure 1. Marestail seedling growing in a no-till field. Due to its small size in the fall, pay special attention during scouting, especially in no-till fields where residue can hide seedlings.

Fall is Optimal for Marestail Management October 28, 2016

With corn and soybean harvest nearing completion in Nebraska this is a great time to begin scouting fields for winter annual weeds like marestail. Timing is critical to successful control of marestail, especially in no-till soybeans as many populations have evolved resistance to glyphosate and ALS-inhibiting herbicides.

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Palmer amaranth
Palmer amaranth

Your Help Needed to Identify Palmer Amaranth Distribution in Nebraska September 2, 2016

Nebraska Extension is requesting help in identifying the distribution of Palmer amaranth in Nebraska by taking this short survey.

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Figure 1: Early-planted rye (left) and late-planted rye before corn at Concord, April 22, 2016.
Figure 1: Early-planted rye (left) and late-planted rye before corn at Concord, April 22, 2016.

Biomass Production of Winter Annual Cover Crops in Corn and Soybean August 11, 2016

Rye was the leading biomass producer in the first two years of a four-year study exploring whether winter cover cropping in no-till corn and soybean systems in Nebraska can benefit soil quality despite their short growing season.

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