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Survey Provides Insights on Distribution and Management of Giant Ragweed in the Corn Belt
  • USA - English


News provided by

Allen Press, Inc.

May 02, 2016, 15:40 ET

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Vol. 64 Issue 2 (April-June 2016)
Vol. 64 Issue 2 (April-June 2016)

Lawrence, KS (PRWEB) May 02, 2016 -- A new survey published in the journal Weed Science offers insights into the distribution and management of giant ragweed, a plant known to cause significant losses in corn, soybean and cotton crops.

Over the past three decades, giant ragweed has become an increasing concern, especially as herbicide-resistant populations have increased. To date, though, scientists have lacked quantitative data on how giant ragweed is distributed and spreads.

Managing giant ragweed in noncrop areas could reduce its migration into crop fields and slow its spread

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To help address this gap, a team of researchers from six universities and the USDA’s Agricultural Research Service surveyed certified crop advisors working in the Corn Belt regions of the U.S. and Canada. The survey explored the prevalence of giant ragweed and gathered information on crop production practices. The responses led to several key findings:

• Distribution and spread. Results suggest that giant ragweed is spreading outward from crop fields in the east-central U.S. Corn Belt. The weed currently is most prolific near the upper Mississippi River and its major tributaries, as well as north of the Ohio River in Indiana and western Ohio.
• Herbicide resistance. Nearly 60 percent of counties represented in the survey have giant ragweed populations that are resistant to ALS-inhibiting herbicides, to glyphosate or to both.
• Impact of crop production practices. Giant ragweed populations are highest in fields that are managed with minimum tillage, planted continuously with soybean crops and treated with multiple applications of a single type of herbicide.
• Impact of ecological factors. The abundance of giant ragweed in crop fields was highly correlated with its abundance in nearby noncrop environments. Populations of giant ragweed were highest in counties that offered early and prolonged periods of emergence and in crop fields with large populations of seed-burying earthworms.

What do these findings mean for growers, weed scientists and regulators?

“Managing giant ragweed in noncrop areas could reduce its migration into crop fields and slow its spread,” says Emily Regnier of Ohio State University, a member of the research team. “Where the weed is already established in crop fields, it is critical that growers focus on diversification. They need to plant a more diverse combination of crop species, use more diverse tillage practices and reduce their reliance on herbicides with a single site of action.”

Full text of the article “Certified Crop Advisors’ Perceptions of Giant Ragweed (Ambrosia trifida)
Distribution, Herbicide Resistance and Management in the Corn Belt
” is now available in Weed Science Vol. 64, Issue 2, April-June, 2016.

About Weed Science

Weed Science is a journal of the Weed Science Society of America, a nonprofit scientific society focused on weeds and their impact on the environment. The publication presents peer-reviewed original research related to all aspects of weed science, including the biology, ecology, physiology, management and control of weeds. To learn more, visit http://www.wssa.net.

Jacob Frese, Allen Press, Inc., http://allenpress.com/publications/journals/ipsm, +1 (785) 865-9248, [email protected]

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