Featured Research

from universities, journals, and other organizations

Field tests seek new control methods for resistant ragweed in cotton crops

Date:
December 5, 2012
Source:
Allen Press Publishing Services
Summary:
Giant ragweed lives up to its name, towering over crops and choking out surrounding plant species. Just one ragweed plant per square meter has been shown to reduce crop yields 45 to 77 percent. Now giant ragweed has evolved resistance to the herbicide glyphosate, which had been effective at controlling the weed.

Weed Technology -- Giant ragweed lives up to its name, towering over crops and choking out surrounding plant species. Just one ragweed plant per square meter has been shown to reduce crop yields 45 to 77 percent. Now giant ragweed has evolved resistance to the herbicide glyphosate, which had been effective at controlling the weed.

Related Articles


The journal Weed Technology reports results of a field test with giant ragweed and WideStrike®, a cotton variety resistant to glyphosate and glufosinate herbicides. Planting this new variety of cotton will allow farmers to treat ragweed without negatively affecting their crop yield.

Giant ragweed has extended its reach from Midwestern corn and soybean fields into Southern cotton crops. Once a bystander in fence rows and ditch banks, giant ragweed now grows rapidly, has an extended period of emergence, and is able to thrive in many environments. These features have made it a major competitor with field crops.

Few postemergence herbicides are providing effective control of resistant giant ragweed. Glufosinate, which currently has no known broadleaf resistance, proved one of the most effective in this study. In 2009, 2010, and 2011, Widestrike cotton was planted in a Tennessee grower's field known to have a population of glyphosate-resistant giant ragweed.

Unfortunately, many of the herbicide treatments in this study reduced cotton yield along with the resistant giant ragweed. Of 12 treatments tested, glufosinate alone, glufosinate plus glyphosate, glyphosate plus pyrithiobac, and glufosinate plus fluometuron were the most effective. The only combination that showed 90 percent control of giant ragweed without reducing crop yield was glufosinate followed by another treatment of glufosinate. However, growers will need to use multiple methods of weed control in the future to prevent weeds from developing resistance to glufosinate as they have with other herbicides.


Story Source:

The above story is based on materials provided by Allen Press Publishing Services. Note: Materials may be edited for content and length.


Journal Reference:

  1. Kelly A. Barnett, Thomas C. Mueller, Lawrence E. Steckel. Glyphosate-Resistant Giant Ragweed (Ambrosia trifida) Control in WideStrike® Flex Cotton. Weed Technology, 2012; 26 (4): 611 DOI: 10.1614/WT-D-12-00042.1

Cite This Page:

Allen Press Publishing Services. "Field tests seek new control methods for resistant ragweed in cotton crops." ScienceDaily. ScienceDaily, 5 December 2012. <www.sciencedaily.com/releases/2012/12/121205102608.htm>.
Allen Press Publishing Services. (2012, December 5). Field tests seek new control methods for resistant ragweed in cotton crops. ScienceDaily. Retrieved October 25, 2014 from www.sciencedaily.com/releases/2012/12/121205102608.htm
Allen Press Publishing Services. "Field tests seek new control methods for resistant ragweed in cotton crops." ScienceDaily. www.sciencedaily.com/releases/2012/12/121205102608.htm (accessed October 25, 2014).

Share This



More Plants & Animals News

Saturday, October 25, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Deep Sea 'mushroom' Could Be Early Branch on Tree of Life

Deep Sea 'mushroom' Could Be Early Branch on Tree of Life

Reuters - Innovations Video Online (Oct. 24, 2014) — Miniature deep sea animals discovered off the Australian coast almost three decades ago are puzzling scientists, who say the organisms have proved impossible to categorise. Academics at the Natural History of Denmark have appealed to the world scientific community for help, saying that further information on Dendrogramma enigmatica and Dendrogramma discoides could answer key evolutionary questions. Jim Drury has more. Video provided by Reuters
Powered by NewsLook.com
Black Bear Cub Goes Sunday Shopping

Black Bear Cub Goes Sunday Shopping

Reuters - Light News Video Online (Oct. 23, 2014) — Price check on honey? Bear cub startles Oregon drugstore shoppers. Rough Cut (no reporter narration). Video provided by Reuters
Powered by NewsLook.com
Dances With Wolves in China's Wild West

Dances With Wolves in China's Wild West

AFP (Oct. 23, 2014) — One man is on a mission to boost the population of wolves in China's violence-wracked far west. The animal - symbol of the Uighur minority there - is under threat with a massive human resettlement program in the region. Duration: 00:41 Video provided by AFP
Powered by NewsLook.com
Breakfast Debate: To Eat Or Not To Eat?

Breakfast Debate: To Eat Or Not To Eat?

Newsy (Oct. 23, 2014) — Conflicting studies published in the same week re-ignited the debate over whether we should be eating breakfast. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:

Strange & Offbeat Stories

 

Plants & Animals

Earth & Climate

Fossils & Ruins

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:  

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins