International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
MULTIPLE RESISTANT LATE WATERGRASS
(Echinochloa phyllopogon (=E. oryzicola))


Multiple Resistance: 2 Sites of Action
ACCase inhibitors (A/1)
Lipid Inhibitors (N/8)

United States, California
INTRODUCTION LATE WATERGRASS
Late Watergrass (Echinochloa phyllopogon (=E. oryzicola)) is a monocot weed in the Poaceae family.  In United States this weed first evolved multiple resistance (to 2 herbicide sites of action) in 2000 and infests Rice.  Multiple resistance has evolved to herbicides in the Groups A/1, and N/8.  These particular biotypes are known to have resistance to cyhalofop-butyl, fenoxaprop-P-ethyl, molinate, and thiobencarb = benthiocarb and they may be cross-resistant to other herbicides in the Groups A/1, and N/8.

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

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.

QUIK STATS (last updated Jan 14, 2003 )

Common NameLate Watergrass
SpeciesEchinochloa phyllopogon (=E. oryzicola)
GroupACCase inhibitors (A/1)
Lipid Inhibitors (N/8)
Herbicidescyhalofop-butyl, fenoxaprop-P-ethyl, molinate, and thiobencarb = benthiocarb
LocationUnited States
Year2000
Situation(s)Rice
Contributors - (Alphabetically)Albert Fischer 
Edit this Case  |  Add New Case of Resistance  |  Add Note

ACADEMIC ASPECTS

Confirmation Tests

Field, and 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

Genetic studies on Group A, N/1, 8 resistant Late Watergrass have not been reported to the site.  There may be a note below or an article discussing the genetics of this biotype in the Fact Sheets and Other Literature
 
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 multiple resistant Late Watergrass from United States please update the database.
 
Edit Case  |  Add Note  |  Add Article  |  Add New Case  |  Help

CONTRIBUTING WEED SCIENTISTS

ALBERT FISCHER
Professor
University Of California
Department of Plant Sciences
Weed Ecophysiology
Mail Stop #4 279/279A Robbins Hall
Davis, 95616, California
United States
Email Albert Fischer
Web   : Web Site Link

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in United States have been instrumental in providing you this information. Particular thanks is given to Albert Fischer for providing detailed information.
Herbicide Resistant Late Watergrass Globally
(Echinochloa phyllopogon (=E. oryzicola))
Herbicide Resistant Late Watergrass Globally
(Echinochloa phyllopogon (=E. oryzicola))
Drag a column header and drop it here to group by that column
Herbicide Resistant Late Watergrass Globally
(Echinochloa phyllopogon (=E. oryzicola))
#CountryFirstYearSituationActive IngredientsSite of Action
1 FranceFrance 2013 Rice penoxsulam 17 ALS inhibitors (B/2)
178Echinochloa phyllopogon (=E. oryzicola)Late Watergrass9935
2 GreeceGreece 2009 Rice bispyribac-sodium, foramsulfuron, imazamox, nicosulfuron, penoxsulam, and rimsulfuron 19 ALS inhibitors (B/2)
178Echinochloa phyllopogon (=E. oryzicola)Late Watergrass13052
3 South KoreaSouth Korea 2006 Rice azimsulfuron, bensulfuron-methyl, bispyribac-sodium, cyhalofop-butyl, fenoxaprop-P-ethyl, halosulfuron-methyl, imazosulfuron, metamifop, pyrazosulfuron-ethyl, pyribenzoxim, and pyriminobac-methyl 27 Multiple Resistance: 2 Sites of Action
ACCase inhibitors (A/1)
ALS inhibitors (B/2)
178Echinochloa phyllopogon (=E. oryzicola)Late Watergrass5392
4 United States (California) United StatesCalifornia1998 Rice fenoxaprop-P-ethyl 45 ACCase inhibitors (A/1)
178Echinochloa phyllopogon (=E. oryzicola)Late Watergrass283
5 United States (California) United StatesCalifornia1998 Rice thiobencarb = benthiocarb 45 Lipid Inhibitors (N/8)
178Echinochloa phyllopogon (=E. oryzicola)Late Watergrass1035
6 United States (California) United StatesCalifornia2000 Rice cyhalofop-butyl, fenoxaprop-P-ethyl, molinate, and thiobencarb = benthiocarb 45 Multiple Resistance: 2 Sites of Action
ACCase inhibitors (A/1)
Lipid Inhibitors (N/8)
178Echinochloa phyllopogon (=E. oryzicola)Late Watergrass5137
Literature about Similar Cases

Page size:
select
Page: of 4
Items 1 to 5 of 18

Page size:
select
Page: of 4
Items 1 to 5 of 18
PERMISSION MUST BE OBTAINED FIRST if you intend to base a significant portion of a scientific paper on data derived from this site.
Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Monday, March 27, 2017 .  Available  www.weedscience.org
Copyright © 1993- 2017 WeedScience.org All rights reserved. Fair use of this material is encouraged. Proper citation is requested.