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

International Survey of Herbicide-Resistant Weeds

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

Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)

Italy

INTRODUCTION		COMMON WATERPLANTAIN
Common Waterplantain (Alisma plantago-aquatica) is a monocot weed in the Alismataceae family. In Italy this weed first evolved resistance to Group 2 (Legacy B) herbicides in 1994 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 cinosulfuron 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, and cinosulfuron
Location	Italy
Year	1994
Situation(s)	Rice
Contributors - (Alphabetically)	Maurizio Sattin
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NOTES ABOUT THIS BIOTYPE

AREAS FOUND

Maurizio Sattin

Pavaia, Vercelli, Milano, Biella. Piemonte, Lombardia

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GENERAL

Maurizio Sattin

There is a generalised cross resistance among the sulfonylureas (Azimsulfuron, Bensulfuron- methyl, Cinosulfuron, Ethoxysulfuron) as well as to the triazolopyrimidine (metosulam), but the level of resistance which appears to be very high for the sulfonylurea it is, in general, much lower for Metosulam. A few populations show very high level of resistance to both sulfonylureas and triazolopyrimidine. Although there is as yet no direct experimental proof, the available information suggests that the resistance mechanism could be a target-site. It is now estimated that between 10,000 and 15,000 ha are affected. Most resistant populations come from Novara Province and were selected by bensulfuron -methyl. The field histories suggest that resistance developed in a paddy rice monoculture system after at least three-four years using an ALS inhibitor alone for controlling these two species. Generally, resistance has not developed where the weed control strategy is devised in relation to the presence of red rice.

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ACADEMIC ASPECTS

Confirmation Tests

Field, and 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 Italy please update the database.

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CONTRIBUTING WEED SCIENTISTS

MAURIZIO SATTIN

Senior Weed Scientist Italian National Research Council (cnr) IBAF - Weed Science Unit Viale dell'Università 16 Legnaro, 35020, Padova Italy Email Maurizio Sattin

ACKNOWLEDGEMENTS
The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Italy have been instrumental in providing you this information. Particular thanks is given to Maurizio Sattin 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