International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP O/4 RESISTANT CORNFLOWER
(Centaurea cyanus)


Synthetic Auxins (O/4)

Poland, North Eastern Region
INTRODUCTION CORNFLOWER
Cornflower (Centaurea cyanus) is a dicot weed in the Asteraceae family.  In Poland this weed first evolved resistance to Group O/4 herbicides in 2012 and infests Winter wheat.   Group O/4 herbicides are known as Synthetic Auxins (Synthetic auxins (action like indoleacetic acid)).  Research has shown that these particular biotypes are resistant to dicamba and they may be cross-resistant to other Group O/4 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 Dec 09, 2013 )

Common NameCornflower
SpeciesCentaurea cyanus
GroupSynthetic Auxins (O/4)
Herbicidesdicamba
LocationPoland, North Eastern Region
Year2012
Situation(s)Winter wheat
Contributors - (Alphabetically)Kazimierz Adamczewski 
Edit this Case  |  Add New Case of Resistance  |  Add Note

NOTES ABOUT THIS BIOTYPE

GENERAL

Kazimierz Adamczewski

General information for Cornflower (Centaurea cyanus) 

In the years 2010-2012 samples from 6 field were collected, the seeds were collected from the field were farmer got poor control of Cornflower. At those field farmers for Cornflower control during many years used herbicides synthetic auxins types.  Susceptible biotype was used as standard Two four replication greenhouse experiments was done.

At first experiment in one dose of three herbicides: dicamba, dichlorprop, and MCPA + MCPP were used.

At second experiment dicamba in 7 deference dose were used, (low and high dose). For each treatment four pot were used as four replication. And 4 weeks after treatment, the plants were cut at the soil surface and their fresh weight was determined. Statistical analysis of date from greenhouse experiments was performed. One biotyp from 6 collected samples was resistant on dicamba. 

One year field trial with dicamba used with 2 doses was determinate.

Mechanism of Resistance. Mechanism of resistance is unknown.

Genetic. The genetic basis of resistance for these biotypes is unknown.

Relative Fitness. There is no done.

Edit this Note  |  Add New Note
 

ACADEMIC ASPECTS

Confirmation Tests

Greenhouse trials comparing a known susceptible Cornflower biotype with this Cornflower 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 O/4 resistant Cornflower 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 O/4 resistant Cornflower from Poland please update the database.
 
Edit Case  |  Add Note  |  Add Article  |  Add New Case  |  Help

CONTRIBUTING WEED SCIENTISTS

KAZIMIERZ ADAMCZEWSKI
Professor
Institute Of Plant Protection - National Research Institute
Depart. Of Weed Science
Str. Wladyslawa Wegorka 20
Poznań, 60-318, Poznań
Poland
Email Kazimierz Adamczewski

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Poland have been instrumental in providing you this information. Particular thanks is given to Kazimierz Adamczewski for providing detailed information.
Herbicide Resistant Cornflower Globally
(Centaurea cyanus)
Herbicide Resistant Cornflower Globally
(Centaurea cyanus)
Drag a column header and drop it here to group by that column
Herbicide Resistant Cornflower Globally
(Centaurea cyanus)
#CountryFirstYearSituationActive IngredientsSite of Action
1 PolandPoland 2010 Winter wheat chlorsulfuron, imazapyr, sulfometuron-methyl, and tribenuron-methyl 33 ALS inhibitors (B/2)
277Centaurea cyanusCornflower5621
2 PolandPoland 2012 Winter wheat dicamba 33 Synthetic Auxins (O/4)
277Centaurea cyanusCornflower6764
Specific Papers about this Case

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

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

12
Page size:
select
Page: of 2
Items 1 to 5 of 7

12
Page size:
select
Page: of 2
Items 1 to 5 of 7
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, May 25, 2019 .  Available  www.weedscience.org
Copyright © 1993- 2019 WeedScience.org All rights reserved. Fair use of this material is encouraged. Proper citation is requested.