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Nebraska: Status of Herbicide-Resistant Weeds

Nebraska: Status of Herbicide-Resistant Weeds

👤By Amit Jhala, University of Nebraska-Lincoln 🕔Mar 27, 2017

There are 480 unique cases of herbicide-resistant weed biotypes globally in 252 weed species (147 dicots and 105 monocots). Weeds have evolved resistance to 23 of 26 known herbicide sites of action and to 161 herbicides. Control of herbicide-resistant weeds

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South Dakota Weeds: Identifying Palmer Pigweed

South Dakota Weeds: Identifying Palmer Pigweed

👤By Gared Shaffer and Sharon Clay., South Dakota State University 🕔Mar 20, 2017

Palmer Amaranth in South Dakota Annual weeds are threat to many cropping systems in South Dakota. Palmer amaranth is a newer threat in the state depending upon your geographical location. Confirmed sightings in a few counties in South Dakota include

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Missouri: Palmer Pigweed Invades 5 More Counties Each Year

Missouri: Palmer Pigweed Invades 5 More Counties Each Year

👤By Linda Geist, University of Missouri 🕔Mar 10, 2017

Waterhemp and Palmer amaranth are easily confused. They are like ugly distant cousins at a family reunion. They look alike until you see them side by side. Their differences become apparent upon closer examination. Palmer amaranth is the bigger bully

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Texas Blacklands: Rain Delays; Disease Watch; Glyphosate Resistant Weed Tips

Texas Blacklands: Rain Delays; Disease Watch; Glyphosate Resistant Weed Tips

👤By Xandra Morris, Blacklands IPM, Texas AgriLife 🕔Feb 28, 2017

Wheat is greening up quickly, with most at Feekes 4-5 and some patches in fields already at first node. No insect populations of concern have been seen or reported this week. Leaf rust may be on the increase due to

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Illinois Soybeans: Do RR2 and Liberty Link Still Work? Yes… With a Lot of Buts.

Illinois Soybeans: Do RR2 and Liberty Link Still Work? Yes… With a Lot of Buts.

👤By Dan Davidson, Illinois Soybean Association 🕔Feb 28, 2017

Weed control has gotten tougher and more complicated over the past 10 years. When Roundup Ready soybeans were first introduced back in 1996, 20 years ago, glyphosate was a one-stop weed control solution. One or two passes were all that

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Nebraska: When is the Best Time for Kochia Control?

Nebraska: When is the Best Time for Kochia Control?

👤By Rodrigo Werle, University of Nebraska-Lincoln 🕔Feb 27, 2017

Q: What is the base temperature for kochia germination? A: The base temperature or minimum soil temperature for the onset of kochia germination is 39°F. Warm weather in February has triggered the onset of kochia germination in parts of western

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Weed Management: New Gene for Atrazine Resistance Identified in Waterhemp

Weed Management: New Gene for Atrazine Resistance Identified in Waterhemp

👤By Lauren Quinn, University of Illinois 🕔Feb 23, 2017

Waterhemp has been locked in an arms race with farmers for decades. Nearly every time farmers attack the weed with a new herbicide, waterhemp becomes resistant to it, reducing or eliminating the efficacy of the chemical. Some waterhemp populations have

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Louisiana: Herbicide Resistance – Mitigating, Managing Resistant Weeds

Louisiana: Herbicide Resistance – Mitigating, Managing Resistant Weeds

👤By Daniel Stephenson and Josh Copes, Louisiana State University 🕔Feb 20, 2017

Louisiana growers across the state must deal with glyphosate resistant palmer pigweed, waterhemp, Italian ryegrass, and Johnsongrass. Although not officially documented, resistant horseweed is also a concern for northern parishes.

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Iowa Weeds: Is 80% of Waterhemp Really Resistant to Group 14 Herbicides?

Iowa Weeds: Is 80% of Waterhemp Really Resistant to Group 14 Herbicides?

👤By Bob Hartzler, Iowa State University 🕔Feb 13, 2017

The University of Illinois Plant Clinic recently published results of their 2016 herbicide resistance screening program.  For a $50 fee the Clinic analyzes waterhemp for resistance to both Group 9 (glyphosate) and Group 14 (PPO inhibitor) herbicides.  Unfortunately, samples from

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Herbicide Resistance: Weed Scientists to Host Farmer Session, Commodity Classic, Texas, March 2-4

Herbicide Resistance: Weed Scientists to Host Farmer Session, Commodity Classic, Texas, March 2-4

👤AgFax Staff 🕔Feb 13, 2017

A much anticipated highlight of the Commodity Classic this year in San Antonio, Texas, March 2-4 will be an event hosted by The Weed Science Society of America (WSSA).  In an effort to get firsthand stories about on-farm experience with herbicide resistance, WSSA is inviting

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