Herbicide Resistant Weeds

GROUP G/9 RESISTANT COMMON RAGWEED (Ambrosia artemisiifolia)
USA: Arkansas

Thursday, September 02, 2010

What's on this page

Common Ragweed

1.	Introduction
2.	Level of Infestation
3.	Quick Statistics
4.	Notes about this biotype
5.	Academic Aspects
6.	R Common Ragweed Globally
7.	Fact Sheets and Literature
8.	Contributing Weed Scientists
9.	Acknowledgements
10.	Where to now?

If we do not have a picture for this weed, or you can provide a better picture (scan, digital camera etc) please please e-mail it to us.

Introduction

Level of Infestation

Common Ragweed (Ambrosia artemisiifolia) is a dicot weed in the Asteraceae family. In Arkansas this weed first evolved resistance to Group G/9 herbicides in 2004 and infests soybean. Group G/9 herbicides are known as Glycines (Inhibition of EPSP synthase). Research has shown that these particular biotypes are resistant to glyphosate and they may be cross-resistant to other Group G/9 herbicides.

Local weed scientists estimate that Group G/9 resistant Common Ragweed in Arkansas infests 1 site. They also estimate that there are 11-50 acres infested with Group G/9 resistant Common Ragweed.

The 'Group' letters/numbers that you see throughout this web site refer to the classification of herbicides by their mode of action. To see a full list of herbicides and HRAC herbicide classifications click here.

QUIK STATS ( last updated Aug 14, 2006 )
Common Name	Common Ragweed
Species	Ambrosia artemisiifolia
Group	Glycines (G/9)
Herbicides	glyphosate
Location	USA, Arkansas
Year	2004
Situation(s)	soybean
Sites	1
Acres Infested	11-50
Contributors	Nilda R. Burgos
Input Data	Edit this Case \| Add New Case of Resistance \| Add Note

ACADEMIC ASPECTS

Confirmation Tests

Greenhouse trials comparing a known susceptible Common Ragweed biotype with this Common Ragweed biotype have been used to confirm resistance. For further information on the tests conducted please contact the local weed scientists that provided this information.

Genetics

The genetic basis of resistance for this biotype is either unknown or has not been entered in the database. If you know anything about the genetic inheritance of this biotype please update the database.

Mechanism of Resistance

The mechanism of resistance for this biotype is either unknown or has not been entered in the database. If you know anything about the mechanism of resistance for this biotype then please update the database.

Relative Fitness

There is no record of differences in fitness or competitiveness of these resistant biotypes when compared to that of normal susceptible biotypes. If you have any information pertaining to the fitness of Group G/9 resistant Common Ragweed from Arkansas please update the database.

Edit Case | Add Note | Add Article | Add New Case | Help

HERBICIDE RESISTANT COMMON RAGWEED GLOBALLY
#	Country	Year	Sites	Acres	Mode of Action
1.	Canada (Ontario)	1976	51-100	501-1000	Photosystem II inhibitors (C1/5)
2.	Canada (Quebec)	1999	11-50	unknown	Ureas and amides (C2/7)
3.	Canada (Ontario)	2000	101-500	10001-100000	ALS inhibitors (B/2)
4.	USA (Michigan)	1990	2-5	11-50	Photosystem II inhibitors (C1/5)
5.	USA (New York)	1993	101-500	1001-10000	Photosystem II inhibitors (C1/5)
6.	USA (Indiana)	1998	unknown	unknown	ALS inhibitors (B/2)
7.	USA (Illinois)	1998	unknown	unknown	ALS inhibitors (B/2)
8.	USA (Michigan)	1998	51-100	10001-100000	ALS inhibitors (B/2)
9.	USA (Minnesota)	1998	1	1-5	ALS inhibitors (B/2)
10.	USA (Ohio)	1998	101-500	1001-10000	ALS inhibitors (B/2)
11.	USA (Missouri)	2004	2-5	51-100	Glycines (G/9)
12.	USA (Arkansas)	2004	1	11-50	Glycines (G/9)
13.	USA (Delaware) Multiple Resistance	2005	2-5	11-50	ALS inhibitors (B/2) PPO inhibitors (E/14)
14.	USA (Ohio) Multiple Resistance	2006	1	501-1000	ALS inhibitors (B/2) Glycines (G/9)
15.	USA (Ohio) Multiple Resistance	2006	1	51-100	ALS inhibitors (B/2) PPO inhibitors (E/14)
16.	USA (Kansas)	2007	1	11-50	Glycines (G/9)

FACT SHEETS AND OTHER LITERATURE	Format
At Present there are no articles on this case of resistance. Please help by adding an article.
Add New Article

Scientific Abstracts on Herbicide Resistant Ambrosia artemisiifolia
A common ragweed population resistant to cloransulam-methyl.
Patzoldt, W. L.; Tranel, P. J.; Alexander, A. L.; Schmitzer, P. R. 2001. A common ragweed population resistant to cloransulam-methyl. Weed Science. 49: 485-490.
Absorption, translocation, and metabolism of imazethapyr in common ragweed (Ambrosia artemisiifolia) and giant ragweed (Ambrosia trifida).
Ballard, T. O., M. E. Foley, and T. T. Bauman. 1995. Absorption, translocation, and metabolism of imazethapyr in common ragweed (Ambrosia artemisiifolia) and giant ragweed (Ambrosia trifida). Weed Science. 43: 572-577.
Weeds resistant to herbicides.
Voevodin, A. V. 1982. Weeds resistant to herbicides. Sel'skoe Khozyaistvo za Rubezhom. 8: 30-34.

CONTRIBUTING WEED SCIENTISTS

NILDA R. BURGOS	Edit
Associate Professor - Weed Physiology University of Arkansas, Fayetteville Crop, Soil and Environmental Sciences 1366 W. Altheimer Drive Fayetteville, 72704, Arkansas USA Email Nilda R. Burgos

Acknowledgements

Where to now?

The Herbicide Resistance Action Committee, The North American Herbicide Resistance Action Committee, the Weed Science Society of America, and weed scientists in Arkansas have been instrumental in providing you this information. Particular thanks is given to Nilda R. Burgos for providing detailed information.

1.	Resistant Weeds Globally
2.	Resistant Weeds in the USA
3.	Herbicides
4.	Weed Researchers
5.	Resistant weeds in Arkansas
6.	Search this site