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New Weed Resistance Hits Nebraska: Waterhemp to HPPD-Inhibiting Herbicides

A population of common waterhemp has developed resistance to postemergent application of HPPD-inhibiting herbicides (e.g., Callisto, Laudis and Impact). This resistance occurred in a seed-corn production system where these HPPD-inhibiting herbicides were repeatedly used over the last five years.

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  • Feb. 10, 2012
    Article

    Spring Marestail Management Strategies

    Ohio State University research on marestail management has shown that a systems approach, involving a combination of herbicide applications, provides the most consistently effective control and reduction in marestail population over time. Given that essentially all of the marestail populations in the state are glyphosate-resistant by now, and something like 25% of these are also resistant to ALS inhibitors (Classic, FirstRate), POST applications are often the least important application in a marestail control program....More
  • Feb. 1, 2012
    Article
    Corn and Soybean Digest

    Corn Herbicides for 2012

    Valent anticipates that Fierce, a pre-emergence herbicide (pyroxasulfone and flumioxazin) for use in reduced-tillage field corn and soybeans, will receive registration for corn in time for the 2012 season. Fierce has shown residual control of weeds including glyphosate-, ALS- and triazine-resistant Palmer amaranth, waterhemp, common lambsquarters, velvetleaf, dandelion, marestail, annual nightshades, pigweed species and annual grasses, the company says....More
  • Feb. 1, 2012
    Article
    Corn and Soybean Digest

    Weed Denial Not Good

    As a farm journalist who has logged vast windshield time on Corn Belt blue highways every summer for umpteen years, something struck me different looking across bean fields in 2011. In a word: statues. Of tall, random and proud water hemp....More
  • Jan. 25, 2012
    video

    Be Proactive in the Weed-Resistance Battle

    Growers from the Midwest took a field tour down south to get a first-hand look at glyphosate resistance in Palmer amaranth. While the growing weed-resistance problem is manageable, farmers need to be proactive. From using residual herbicides and tank-mixing other herbicides with Roundup, to making sure weeds don't go to seed, there are management strategies to combat the resistance....More
  • Jan. 24, 2012
    Article

    Spray Water Quality Matters in Herbicide Efficacy

    A series of studies at Purdue University has shown that spray water pH and hardness can reduce the effectiveness of herbicides, making it vitally important for crop producers to test water sources. Hard water or water with pH values as low as 4 or as high as 9 have been shown to lower the efficacy of herbicides, including glyphosate, nicosulfuron and saflufenacil, says Bill Johnson, Purdue Extension weed scientist and professor of botany and plant pathology. An ideal pH value would be 6-7....More
  • Jan. 17, 2012
    Article
    Corn and Soybean Digest

    Weed Revolt Marches On | Glyphosate-Resistant Weed Population Grows Rapidly

    Your herbicide plans for 2012 should not include glyphosate use alone, because the weeds are winning. Weed scientists continue to see glyphosate’s effectiveness falter....More
  • Jan. 17, 2012
    Article
    Corn and Soybean Digest

    Can You Tame Superweeds? | Farmers Should Rewrite Weed-Control Programs Due To Herbicide Resistance

    You know the villains – waterhemp, marestail, pigweed and other pilferers of water and soil nutrients. They’re the plants you spend $50/acre to kill, yet zestfully return, especially if these prolific weed-seed producers like waterhemp are allowed to spread 300,000 herbicide-resistant seeds per plant at harvest....More
  • Jan. 1, 2012
    Article
    Corn and Soybean Digest

    Pigweed Will Strangle Yields | Early Weed Control a Must for Corn, Soybeans

    Dallas Peterson’s weed-research plots rival the rankest weed-ravaged fields anywhere. And head-high pigweed offers examples of what can happen to corn and soybeans fields if the yield-punishing plants aren’t controlled early....More
  • Dec. 2, 2011
    Article

    Herbicide May Affect Plants Thought To Be Resistant

    Purdue University researchers have discovered a fine-tuning mechanism involved in plant root growth that has them questioning whether a popular herbicide may have unintended consequences, causing some plants to need more water or nutrients....More
  • Nov. 3, 2011
    Article

    Potential for Herbicide Carryover in 2012?

    Producers contended with precipitation extremes in the 2011 growing season that could lead to herbicide carryover, says Aaron Hager, University of Illinois Extension weed specialist....More
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