<b>HRAC Group 2</b> <font size='2'> (Legacy B) </font> resistant Sorghum bicolor from United States, Iowa

International Survey of Herbicide-Resistant Weeds

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Thursday, November 21, 2024

HRAC GROUP 2 (LEGACY B) RESISTANT SHATTERCANE
(Sorghum bicolor)

Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)

United States, Iowa

INTRODUCTION		SHATTERCANE
Shattercane (Sorghum bicolor) is a monocot weed in the Poaceae family. In Iowa this weed first evolved resistance to Group 2 (Legacy B) herbicides in 1998 and infests Corn (maize). 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 imazethapyr 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 Dec 28, 2004 )
Common Name	Shattercane
Species	Sorghum bicolor
Group	Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
Herbicides	imazethapyr
Location	United States, Iowa
Year	1998
Situation(s)	Corn (maize)
Contributors - (Alphabetically)	Ian Zelaya
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NOTES ABOUT THIS BIOTYPE

GENERAL

Ian Zelaya

The resistant shattercane biotype was collected in Malvern, IA. Greenhouse and laboratory studies confirmed that the Malvern, IA biotype was susceptible to nicosulfuron but was resistant to imazethapyr (GR50 R:S ratio = 29). The susceptible shattercane biotype was collected at Curtiss Farm in Ames, IA. Source: Zelaya, I. A., and M. D. K. Owen. 2004. Evolved resistance to acetolactate synthase-inhibiting herbicides in common sunflower (Helianthus annuus), giant ragweed (Ambrosia trifida), and shattercane (Sorghum bicolor) in Iowa. Weed Science 52:538-548.

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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse, and Laboratory trials comparing a known susceptible Shattercane biotype with this Shattercane 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 Shattercane 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 Shattercane from Iowa please update the database.

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CONTRIBUTING WEED SCIENTISTS

IAN ZELAYA

Syngenta Weed Control Unit Carrera 7 No. 113-43 Piso 10 Bogotá Colombia Email Ian Zelaya Web : Web Site Link

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

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Herbicide Resistant Shattercane Globally
(Sorghum bicolor)

Country

FirstYear

Situation

Active Ingredients

Site of Action

United States (Nebraska)

1994

Corn (maize)

primisulfuron-methyl