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

INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE

HRAC GROUP 2 (LEGACY B) RESISTANT TAIWAN-YAMAI
(Schoenoplectus wallichii)

Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)

Japan, Miyagi

INTRODUCTION		TAIWAN-YAMAI
Taiwan-yamai (Schoenoplectus wallichii) is a monocot weed in the Cyperaceae family. In Japan this weed first evolved resistance to Group 2 (Legacy B) herbicides in 2000 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 Jan 08, 2014 )
Common Name	Taiwan-yamai
Species	Schoenoplectus wallichii
Group	Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
Herbicides	bensulfuron-methyl
Location	Japan, Miyagi
Year	2000
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 Taiwan-yamai biotype with this Taiwan-yamai 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 Taiwan-yamai 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 Taiwan-yamai 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 Taiwan-yamai Globally
(Schoenoplectus wallichii)

Country

FirstYear

Situation

Active Ingredients

Site of Action

Japan

2000

Rice

bensulfuron-methyl

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

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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. Thursday, November 21, 2024 . Available www.weedscience.org Copyright © 1993- 2024 WeedScience.org All rights reserved. Fair use of this material is encouraged. Proper citation is requested.