<b>HRAC Group 2</b> <font size='2'> (Legacy B) </font> resistant Rotala pusilla from Japan

INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE

HRAC GROUP 2 (LEGACY B) RESISTANT MIZU-MATSUBA
(Rotala pusilla)

Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)

Japan, Yamaguchi

INTRODUCTION		MIZU-MATSUBA
Mizu-matsuba (Rotala pusilla) is a dicot weed in the Lythraceae family. In Japan this weed first evolved resistance to Group 2 (Legacy B) herbicides in 2007 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 imazosulfuron, and pyrazosulfuron-ethyl 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 Jan 08, 2014 )
Common Name	Mizu-matsuba
Species	Rotala pusilla
Group	Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
Herbicides	imazosulfuron, and pyrazosulfuron-ethyl
Location	Japan, Yamaguchi
Year	2007
Situation(s)	Rice
Contributors - (Alphabetically)	Satoshi Iwakami, and Akira Uchino
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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse, and Laboratory trials comparing a known susceptible Mizu-matsuba biotype with this Mizu-matsuba 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 Mizu-matsuba 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 Mizu-matsuba from Japan please update the database.

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CONTRIBUTING WEED SCIENTISTS

SATOSHI IWAKAMI

Weed Scientist University of Tsukuba Faculty of Life and Environmental Sciences 1-1-1 Tennoudai Tsukuba, 305-8577, Ibaraki Japan Email Satoshi Iwakami

AKIRA UCHINO

Weed Scientist NARO Agricultural Research Center Faculty of Life and Environmental Sciences 3-1-1 Kannondai Tsukuba, 305-8666, Ibaraki Japan Email Akira Uchino

ACKNOWLEDGEMENTS
The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Japan have been instrumental in providing you this information. Particular thanks is given to Satoshi Iwakami, and Akira Uchino for providing detailed information.

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Herbicide Resistant Mizu-matsuba Globally
(Rotala pusilla)

Country

FirstYear

Situation

Active Ingredients

Site of Action

Japan

2007

Rice

imazosulfuron, and pyrazosulfuron-ethyl

Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)

Literature about Similar Cases

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PERMISSION MUST BE OBTAINED FIRST if you intend to base a significant portion of a scientific paper on data derived from this site. Citation:
Heap, I. The International Herbicide-Resistant Weed Database. Online. Sunday, December 29, 2024 . Available www.weedscience.org Copyright © 1993- 2024 WeedScience.org All rights reserved. Fair use of this material is encouraged. Proper citation is requested.