International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP B/2 RESISTANT ARROWLEAFED MONOCHORIA
(Monochoria vaginalis)


ALS inhibitors (B/2)

China, Anhui Province
INTRODUCTION ARROWLEAFED MONOCHORIA
Arrowleafed Monochoria (Monochoria vaginalis) is a monocot weed in the Pontederiaceae family.  In China this weed first evolved resistance to Group B/2 herbicides in 2010 and infests Rice.   Group B/2 herbicides are known as ALS inhibitors (Inhibition of acetolactate synthase ALS (acetohydroxyacid synthase AHAS)).  Research has shown that these particular biotypes are resistant to bensulfuron-methyl and they may be cross-resistant to other Group B/2 herbicides.

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 Jun 13, 2012 )

Common NameArrowleafed Monochoria
SpeciesMonochoria vaginalis
GroupALS inhibitors (B/2)
Herbicidesbensulfuron-methyl
LocationChina, Anhui Province
Year2010
Situation(s)Rice
Contributors - (Alphabetically)Xuegang Peng 
Edit this Case  |  Add New Case of Resistance  |  Add Note

ACADEMIC ASPECTS

Confirmation Tests

Field trials comparing a known susceptible Arrowleafed Monochoria biotype with this Arrowleafed Monochoria 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 B/2 resistant Arrowleafed Monochoria 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 Group B/2 resistant Arrowleafed Monochoria from China please update the database.
 
Edit Case  |  Add Note  |  Add Article  |  Add New Case  |  Help

CONTRIBUTING WEED SCIENTISTS

XUEGANG PENG
Research Associate
Qingdao kingagroot Ltd.
Research institute of maligant weeds
Qingdao
China
Email Xuegang Peng

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in China have been instrumental in providing you this information. Particular thanks is given to Xuegang Peng for providing detailed information.
Herbicide Resistant Arrowleafed Monochoria Globally
(Monochoria vaginalis)
Herbicide Resistant Arrowleafed Monochoria Globally
(Monochoria vaginalis)
Drag a column header and drop it here to group by that column
Herbicide Resistant Arrowleafed Monochoria Globally
(Monochoria vaginalis)
#CountryFirstYearSituationActive IngredientsSite of Action
1 ChinaChina 2010 Rice bensulfuron-methyl 9 ALS inhibitors (B/2)
202Monochoria vaginalisArrowleafed Monochoria5655
2 JapanJapan 1998 Rice bensulfuron-methyl 25 ALS inhibitors (B/2)
202Monochoria vaginalisArrowleafed Monochoria7764
3 South KoreaSouth Korea 1999 Rice bensulfuron-methyl 27 ALS inhibitors (B/2)
202Monochoria vaginalisArrowleafed Monochoria151
Literature about Similar Cases

Page size:
select
Page: of 5
Items 1 to 5 of 24

Page size:
select
Page: of 5
Items 1 to 5 of 24
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, September 16, 2019 .  Available  www.weedscience.org
Copyright © 1993- 2019 WeedScience.org All rights reserved. Fair use of this material is encouraged. Proper citation is requested.