Herbicide Resistant Weeds

MULTIPLE RESISTANT LATE WATERGRASS (Echinochloa phyllopogon)
Resistance to herbicides in groups A/1, B/2, and N/8
South Korea

Tuesday, September 07, 2010

What's on this page

Late Watergrass

1.	Introduction
2.	Level of Infestation
3.	Quick Statistics
4.	Notes about this biotype
5.	Academic Aspects
6.	R Late Watergrass 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

Late Watergrass (Echinochloa phyllopogon) is a monocot weed in the Poaceae family. In South Korea this weed first evolved multiple resistance ( to 3 herbicide modes of action) in 2006 and infests rice. Multiple resistance has evolved to herbicides in the Groups A/1, B/2, and N/8. These particular biotypes are known to have resistance to azimsulfuron, bensulfuron-methyl, bispyribac-Na, cyhalofop-butyl, fenoxaprop-P-ethyl, halosulfuron-methyl, imazosulfuron, molinate, pyrazosulfuron-ethyl, pyribenzoxim, and pyriminobac-methyl and they may be cross-resistant to other herbicides in the Groups A/1, B/2, and N/8.

Local weed scientists estimate that multiple resistant Late Watergrass in South Korea infests 51-100 sites and the number of sites are increasing. They also estimate that there are 51-100 acres infested with multiple resistant Late Watergrass and the area infested is increasing.

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 Nov 01, 2009 )
Common Name	Late Watergrass
Species	Echinochloa phyllopogon
Group	ACCase inhibitors (A/1) ALS inhibitors (B/2) Thiocarbamates and others (N/8)
Herbicides	azimsulfuron, bensulfuron-methyl, bispyribac-Na, cyhalofop-butyl, fenoxaprop-P-ethyl, halosulfuron-methyl, imazosulfuron, molinate, pyrazosulfuron-ethyl, pyribenzoxim, and pyriminobac-methyl
Location	South Korea
Year	2006
Situation(s)	rice
Sites	51-100
Acres Infested	51-100
Contributors	Il-bin Im
Input Data	Edit this Case \| Add New Case of Resistance \| Add Note

ACADEMIC ASPECTS

Confirmation Tests

Greenhouse trials comparing a known susceptible Late Watergrass biotype with this Late Watergrass 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

Researchers have indicated that Group A, B, N/1, 2, 8 resistant Late Watergrass is ecologically less fit than normal susceptible Late Watergrass. There may be a note below or an article discussing the fitness of this biotype in the "Fact Sheets and Other Literature"

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

HERBICIDE RESISTANT LATE WATERGRASS GLOBALLY
#	Country	Year	Sites	Acres	Mode of Action
1.	South Korea Multiple Resistance	2006	51-100	51-100	ACCase inhibitors (A/1) ALS inhibitors (B/2) Thiocarbamates and others (N/8)
2.	USA (California)	1998	11-50	1001-10000	ACCase inhibitors (A/1)
3.	USA (California)	1998	11-50	1001-10000	Thiocarbamates and others (N/8)
4.	USA (California) Multiple Resistance	2000	11-50	101-500	ACCase inhibitors (A/1) Thiocarbamates and others (N/8)

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 Echinochloa phyllopogon
Herbicide-resistant Echinochloa oryzoides and E. phyllopogon in California Oryza sativa fields.
Fischer, A. J., C. Ateh M., D. Bayer E., and J. Hill E. 2000. Herbicide-resistant Echinochloa oryzoides and E. phyllopogon in California Oryza sativa fields. Weed Science. 48: 225-230.

CONTRIBUTING WEED SCIENTISTS

IL-BIN IM	Edit
Researcher Bio-Plant Environment Research Center Weed science Sin-dong 765-23 Sindong Jeil 101-802 Iksan , 570-170, Junbuk South Korea Email Il-bin Im Web : Web Site Link

Acknowledgements

Where to now?

The Herbicide Resistance Action Committee, the Weed Science Society of America, and weed scientists in South Korea have been instrumental in providing you this information. Particular thanks is given to Il-bin Im for providing detailed information.

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