International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
HRAC GROUP 5 (LEGACY C1 C2) RESISTANT PROSTRATE PIGWEED
(Amaranthus blitoides)


PSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2)

Spain
INTRODUCTION PROSTRATE PIGWEED
Prostrate Pigweed (Amaranthus blitoides) is a dicot weed in the Amaranthaceae family.  In Spain this weed first evolved resistance to Group 5 (Legacy C1 C2) herbicides in 1986 and infests Orchards.   Group 5 (Legacy C1 C2) herbicides are known as PSII inhibitors - Serine 264 Binders (Inhbition of Photosynthesis at PSll - Serine 264 Binders ).  Research has shown that these particular biotypes are resistant to simazine and they may be cross-resistant to other Group 5 (Legacy C1 C2) 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 Nov 18, 2000 )

Common NameProstrate Pigweed
SpeciesAmaranthus blitoides
GroupPSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2)
Herbicidessimazine
LocationSpain
Year1986
Situation(s)Orchards
Contributors - (Alphabetically)Rafael De Prado 
Edit this Case  |  Add New Case of Resistance  |  Add Note

NOTES ABOUT THIS BIOTYPE

GENERAL

Rafael De Prado
Target site mechanism of resistance.

Edit this Note  |  Add New Note
 

ACADEMIC ASPECTS

Confirmation Tests

Field, Greenhouse, and Laboratory trials comparing a known susceptible Prostrate Pigweed biotype with this Prostrate Pigweed 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 HRAC Group 5 resistant Prostrate Pigweed 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

Studies on the mechanism of resistance of Group 5 (Legacy C1 C2) resistant Prostrate Pigweed from Spain indicate that resistance is due to an altered target site.  There may be a note below or an article discussing the mechanism of resistance in the Fact Sheets and Other Literature
 
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 5 (Legacy C1 C2) resistant Prostrate Pigweed from Spain please update the database.
 
Edit Case  |  Add Note  |  Add Article  |  Add New Case  |  Help

CONTRIBUTING WEED SCIENTISTS

RAFAEL DE PRADO
Universidad De Cordoba
Qvimica Agricola Y Edafologa
E T S Ingenieros Agronomos
PO Box 119
Cordoba, E-14080, Andalusia
Spain
Email Rafael De Prado

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Spain have been instrumental in providing you this information. Particular thanks is given to Rafael De Prado for providing detailed information.
Herbicide Resistant Prostrate Pigweed Globally
(Amaranthus blitoides)
Herbicide Resistant Prostrate Pigweed Globally
(Amaranthus blitoides)
Drag a column header and drop it here to group by that column
Herbicide Resistant Prostrate Pigweed Globally
(Amaranthus blitoides)
#CountryFirstYearSituationActive IngredientsSite of Action
1 IsraelIsrael 1983 Cropland, and Roadsides atrazine, and simazine 23 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
9Amaranthus blitoidesProstrate Pigweed100
2 IsraelIsrael 1991 Forests, and Roadsides atrazine, chlorsulfuron, and simazine 23 Multiple Resistance: 2 Sites of Action
Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
9Amaranthus blitoidesProstrate Pigweed108
3 SpainSpain 1986 Orchards simazine 38 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
9Amaranthus blitoidesProstrate Pigweed183
4 United States (Michigan) United StatesMichigan2012 Mint terbacil 45 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
9Amaranthus blitoidesProstrate Pigweed5736
Specific Papers about this Case

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

1
Page size:
select
Page: of 1
Items 1 to 4 of 4
Literature about Similar Cases

123
Page size:
select
Page: of 3
Items 1 to 5 of 11

123
Page size:
select
Page: of 3
Items 1 to 5 of 11
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.  Tuesday, November 12, 2024 .  Available  www.weedscience.org
Copyright © 1993- 2024 WeedScience.org All rights reserved. Fair use of this material is encouraged. Proper citation is requested.