International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
MULTIPLE RESISTANT PROSTRATE PIGWEED
(Amaranthus blitoides)


Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
Photosystem II inhibitors (C1/5)

Israel
INTRODUCTION PROSTRATE PIGWEED
Prostrate Pigweed (Amaranthus blitoides) is a dicot weed in the Amaranthaceae family.  In Israel this weed first evolved multiple resistance (to 2 herbicide sites of action) in 1991 and infests Forests, and Roadsides.  Multiple resistance has evolved to herbicides in the Groups B/2, and C1/5.  These particular biotypes are known to have resistance to atrazine, chlorsulfuron, and simazine and they may be cross-resistant to other herbicides in the Groups B/2, and C1/5.

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 Nov 18, 2000 )

Common NameProstrate Pigweed
SpeciesAmaranthus blitoides
GroupALS inhibitors (B/2)
Photosystem II inhibitors (C1/5)
Herbicidesatrazine, chlorsulfuron, and simazine
LocationIsrael
Year1991
Situation(s)Forests, and Roadsides
Contributors - (Alphabetically)Baruch Rubin 
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NOTES ABOUT THIS BIOTYPE

AREAS FOUND

Baruch Rubin
Ganot and Shoreq areas which represent the central part of the country.

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GENERAL

Baruch Rubin
Resistance to both sulfonylureas and triazines. Multiple resistance.

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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 Group B, C1/2, 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 multiple resistant Prostrate Pigweed from Israel 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

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 multiple resistant Prostrate Pigweed from Israel.
 
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CONTRIBUTING WEED SCIENTISTS

BARUCH RUBIN
Professor
Hebrew University Of Jerusalem
Inst. Plant Sci. & Genetics In Agriculture
Faculty Of Agric.
Food & Environm.
Rehovot, 76100, Israel
Israel
Email Baruch Rubin

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Israel have been instrumental in providing you this information. Particular thanks is given to Baruch Rubin for providing detailed information.
Herbicide Resistant Prostrate Pigweed Globally
(Amaranthus blitoides)
Herbicide Resistant Prostrate Pigweed Globally
(Amaranthus blitoides)
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Herbicide Resistant Prostrate Pigweed Globally
(Amaranthus blitoides)
#CountryFirstYearSituationActive IngredientsSite of Action
1 IsraelIsrael 1983 Cropland, and Roadsides atrazine, and simazine 23 Photosystem II inhibitors (C1/5)
9Amaranthus blitoidesProstrate Pigweed100
2 IsraelIsrael 1991 Forests, and Roadsides atrazine, chlorsulfuron, and simazine 23 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
Photosystem II inhibitors (C1/5)
9Amaranthus blitoidesProstrate Pigweed108
3 SpainSpain 1986 Orchards simazine 38 Photosystem II inhibitors (C1/5)
9Amaranthus blitoidesProstrate Pigweed183
4 United States (Michigan) United StatesMichigan2012 Mint terbacil 45 Photosystem II inhibitors (C1/5)
9Amaranthus blitoidesProstrate Pigweed5736
Literature about Similar Cases

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