International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP B/2 RESISTANT LIVID AMARANTH
(Amaranthus blitum (ssp. oleraceus))


ALS inhibitors (B/2)

United States, New Jersey
INTRODUCTION LIVID AMARANTH
Livid Amaranth (Amaranthus blitum (ssp. oleraceus)) is a dicot weed in the Amaranthaceae family.  In New Jersey this weed first evolved resistance to Group B/2 herbicides in 1993 and infests Cabbages, Lettuce, and Onions.   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 imazethapyr 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 Sep 15, 2000 )

Common NameLivid Amaranth
SpeciesAmaranthus blitum (ssp. oleraceus)
GroupALS inhibitors (B/2)
Herbicidesimazethapyr
LocationUnited States, New Jersey
Year1993
Situation(s)Cabbages, Lettuce, and Onions
Contributors - (Alphabetically)Bradley Majek 
Edit this Case  |  Add New Case of Resistance  |  Add Note

NOTES ABOUT THIS BIOTYPE

AREAS FOUND

Bradley Majek
Great Meadows, NJ

Edit this Note  |  Add New Note
 
GENERAL

Bradley Majek
Resistant to all tested ALS inibitors, including imidazonlinones and SU's. Resistance developed within 3 years of continuous and exclusive use of Pursuit for control.

Edit this Note  |  Add New Note
 

ACADEMIC ASPECTS

Confirmation Tests

Field, and Laboratory trials comparing a known susceptible Livid Amaranth biotype with this Livid Amaranth 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 Livid Amaranth 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 Livid Amaranth from New Jersey please update the database.
 
Edit Case  |  Add Note  |  Add Article  |  Add New Case  |  Help

CONTRIBUTING WEED SCIENTISTS

BRADLEY MAJEK
Extension Weed Specialist
Rutgers University
Department of Plant Biology and Pathology
121 Northville Rd.
Bridgeton, 08302, New Jersey
United States
Email Bradley Majek
Web   : Web Site Link

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in New Jersey have been instrumental in providing you this information. Particular thanks is given to Bradley Majek for providing detailed information.
Herbicide Resistant Livid Amaranth Globally
(Amaranthus blitum (ssp. oleraceus))
Herbicide Resistant Livid Amaranth Globally
(Amaranthus blitum (ssp. oleraceus))
Drag a column header and drop it here to group by that column
Herbicide Resistant Livid Amaranth Globally
(Amaranthus blitum (ssp. oleraceus))
#CountryFirstYearSituationActive IngredientsSite of Action
1 FranceFrance 1981 Corn (maize) atrazine 17 Photosystem II inhibitors (C1/5)
13Amaranthus blitum (ssp. oleraceus)Livid Amaranth454
2 MalaysiaMalaysia 1990 Vegetables paraquat 28 PSI Electron Diverter (D/22)
13Amaranthus blitum (ssp. oleraceus)Livid Amaranth137
3 SwitzerlandSwitzerland 1978 Grapes simazine 41 Photosystem II inhibitors (C1/5)
13Amaranthus blitum (ssp. oleraceus)Livid Amaranth196
4 United States (New Jersey) United StatesNew Jersey1993 Cabbages, Lettuce, and Onions imazethapyr 45 ALS inhibitors (B/2)
13Amaranthus blitum (ssp. oleraceus)Livid Amaranth1167
Literature about Similar Cases

1
Page size:
select
Page: of 1
Items 1 to 2 of 2

1
Page size:
select
Page: of 1
Items 1 to 2 of 2
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.  Saturday, December 14, 2019 .  Available  www.weedscience.org
Copyright © 1993- 2019 WeedScience.org All rights reserved. Fair use of this material is encouraged. Proper citation is requested.