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COMMON CHICKWEED
(
Stellaria media
)
with
GROUP B/2 resistance: (INHIBITION OF ACETOLACTATE SYNTHASE )
Inhibition of Acetolactate Synthase
MUTATION: PROLINE 197 to GLUTAMINE
Common Chickweed
(
Stellaria media
) is a dicot plant in the caryophyllaceae family. A single amino acid substitution from Proline 197 to Glutamine has led to resistance to Inhibition of Acetolactate Synthase as indicated in the table below.
Common Chickweed
Chemical Family
Example Herbicide
Resistance Level
Imidazolinones
Imazethapyr
Not Determined
Pyrimidinyl benzoates
Bispyribac-Na
Not Determined
Sulfonylureas
Chlorsulfuron
Resistant > 10 fold
Triazolopyrimidine - Type 1
Chloransulam-methyl
Susceptible
Triazolinones
Flucarbazone-Na
Not Determined
REFERENCES
Marshall, R. ; Hull, R. ; Moss, S. R.
.
2010
.
Target site resistance to ALS inhibiting herbicides in
Papaver rhoeas
and
Stellaria media
biotypes from the UK
.
Weed Research (Oxford)
50
:
621 - 630
.
Acetolactate synthase (ALS) inhibiting herbicides play an important role in controlling broad-leaved weeds. Biotypes of
Stellaria media
and
Papaver rhoeas
showing resistance to ALS inhibiting sulfonylurea herbicides (e.g. metsulfuron) were first identified in 2000 and 2001, respectively, in the UK. Recent work has shown that resistance in both species is due to mutation of the ALS gene conferring an altered herbicide binding site. Three
P. rhoeas
test biotypes from three areas possessed ALS gene point mutations (Pro-197-Leu or Pro-197-His) conferring ALS target site resistance. All were highly resistant to the sulfonylurea herbicides metsulfuron-methyl and tribenuron-methyl. Several alternative herbicides were tested against resistant
P. rhoeas
, with MCPA and ioxynil+bromoxynil being most effective. Four resistant biotypes of
S. media
were identified from widely separated locations. Two different mutations conferring ALS target site resistance were confirmed in two of these biotypes. A mutation conferring Pro-197-Gln substitution in a biotype from Perthshire was associated with resistance to metsulfuron, but not to florasulam. A mutation conferring Trp-574-Leu substitution in the biotype from Aberdeenshire conferred resistance to both herbicides. This is the first characterisation of ALS gene point mutations in resistant
S. media
. Currently, there are good alternatives for control of resistant biotypes, including fluroxypyr and mecoprop-P. The potential loss of alternative modes of action, as a consequence of reforms to the regulatory system for pesticides in the EU, represents one of the main threats to continued control of ALS resistant
S. media
.
.
This case was entered by Patrick Tranel Email:
tranel@illinois.edu
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, September 7, 2024
. Available
www.weedscience.org
Copyright � 1993-
2024
WeedScience.org All rights reserved. Fair use of this material is encouraged. Proper citation is requested.
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