<b>HRAC Group 2</b> <font size='2'> (Legacy B) </font> resistant Alisma plantago-aquatica from Portugal

International Survey of Herbicide-Resistant Weeds

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Thursday, October 31, 2024

HRAC GROUP 2 (LEGACY B) RESISTANT COMMON WATERPLANTAIN
(Alisma plantago-aquatica)

Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)

Portugal

INTRODUCTION		COMMON WATERPLANTAIN
Common Waterplantain (Alisma plantago-aquatica) is a monocot weed in the Alismataceae family. In Portugal this weed first evolved resistance to Group 2 (Legacy B) herbicides in 1995 and infests Rice. Group 2 (Legacy B) herbicides are known as Inhibition of Acetolactate Synthase (Inhibition of Acetolactate Synthase ). Research has shown that these particular biotypes are resistant to bensulfuron-methyl and they may be cross-resistant to other Group 2 (Legacy B) 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.

QUIK STATS (last updated Sep 15, 2000 )
Common Name	Common Waterplantain
Species	Alisma plantago-aquatica
Group	Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
Herbicides	bensulfuron-methyl
Location	Portugal
Year	1995
Situation(s)	Rice
Contributors - (Alphabetically)	Isabel Calha
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NOTES ABOUT THIS BIOTYPE

AREAS FOUND

Isabel Calha

Coruche (Vale Do Sorraia) ; Alcacer Sal (Vale Do Sado).

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GENERAL

Isabel Calha

Cross-resistance to other sulfonylureas, such as cinosulfuron. Resistant survived 1000 g ai/ha bensulfuron-methyl, susceptible was killed at 64 g ai/ha.

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GENERAL

Isabel Calha

A notice was published in the EWRS newsletter no. 65.

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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse trials comparing a known susceptible Common Waterplantain biotype with this Common Waterplantain 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 2 resistant Common Waterplantain 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 2 (Legacy B) resistant Common Waterplantain from Portugal please update the database.

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CONTRIBUTING WEED SCIENTISTS

ISABEL CALHA

Instituto Nacional De Recursos Biológicos, Ip (inrb I.p. ) Laboratório Nacional De Investigação Agrária (linia) Unidade De Investigação De Protecção De Plantas (uipp) Dept of Agronomy& Plant Genetics 411 Borlaug Hall, 1991 Upper Buford Circle Oeiras, 2784-505 Portugal Email Isabel Calha

ACKNOWLEDGEMENTS
The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Portugal have been instrumental in providing you this information. Particular thanks is given to Isabel Calha for providing detailed information.

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Herbicide Resistant Common Waterplantain Globally
(Alisma plantago-aquatica)

Country

FirstYear

Situation

Active Ingredients

Site of Action

Chile

2005

Rice

bensulfuron-methyl