International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP C1/5 RESISTANT PROSTRATE KNOTWEED
(Polygonum aviculare)


Photosystem II inhibitors (C1/5)

Netherlands
INTRODUCTION PROSTRATE KNOTWEED
Prostrate Knotweed (Polygonum aviculare) is a dicot weed in the Polygonaceae family.  In Netherlands this weed first evolved resistance to Group C1/5 herbicides in 1987 and infests Corn (maize), and Cropland.   Group C1/5 herbicides are known as Photosystem II inhibitors (Inhibition of photosynthesis at photosystem II).  Research has shown that these particular biotypes are resistant to atrazine and they may be cross-resistant to other Group C1/5 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.

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QUIK STATS (last updated Sep 15, 2000 )

Common NameProstrate Knotweed
SpeciesPolygonum aviculare
GroupPhotosystem II inhibitors (C1/5)
Herbicidesatrazine
LocationNetherlands
Year1987
Situation(s)Corn (maize), and Cropland
Contributors - (Alphabetically) 
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NOTES ABOUT THIS BIOTYPE

GENERAL

Homer LeBaron. 1991. Distribution and Seriousness of Herbicide-Resistant Weed Infestations Worldwide. In: Herbicide Resistance in Weeds and Crops. Oorschot, J. L. P. van//Straathof, H. J. M. 1989. On the occurrence and distribution of chlorplastic resistance of weeds to triazines in the Netherlands.

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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse trials comparing a known susceptible Prostrate Knotweed biotype with this Prostrate Knotweed 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 C1/5 resistant Prostrate Knotweed 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

Triazine resistant weeds often exhibit a lower relative fitness when compared to susceptible biotypes.  The most common mutation conferring triazine resistance (Ser 264 to Gly mutation of the psbA gene) also causes a reduction in CO2 fixation, quantum yield, and seed and biomass production.  There is no record in this database referring specifically to fitness studies on Group C1/5 resistant Prostrate Knotweed from Netherlands.
 
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CONTRIBUTING WEED SCIENTISTS


ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Netherlands have been instrumental in providing you this information. 
Herbicide Resistant Prostrate Knotweed Globally
(Polygonum aviculare)
Herbicide Resistant Prostrate Knotweed Globally
(Polygonum aviculare)
Drag a column header and drop it here to group by that column
Herbicide Resistant Prostrate Knotweed Globally
(Polygonum aviculare)
#CountryFirstYearSituationActive IngredientsSite of Action
1 BelgiumBelgium 1984 Apples amitrole 3 Carotenoid biosynthesis (unknown target) (F3/11)
131Polygonum aviculareProstrate Knotweed40
2 NetherlandsNetherlands 1987 Corn (maize), and Cropland atrazine 43 Photosystem II inhibitors (C1/5)
131Polygonum aviculareProstrate Knotweed293
Literature about Similar Cases

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