Herbicide Resistant Weeds

GROUP B/2 RESISTANT STARFRUIT (Damasonium minus)
Australia: New South Wales

Tuesday, February 09, 2010

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Starfruit

1.	Introduction
2.	Level of Infestation
3.	Quick Statistics
4.	Notes about this biotype
5.	Academic Aspects
6.	R Starfruit Globally
7.	Fact Sheets and Literature
8.	Contributing Weed Scientists
9.	Acknowledgements
10.	Where to now?

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Introduction

Level of Infestation

Starfruit (Damasonium minus) is a monocot weed in the Alismataceae family. In New South Wales this weed first evolved resistance to Group B/2 herbicides in 1994 and infests rice. Group B/2 herbicides are known as ALS inhibitors (Inhibition of acetolactate synthase ALS (acetohydroxyacid synthase AHAS)). Research has shown that these particular biotypes are resistant to bensulfuron-methyl and they may be cross-resistant to other Group B/2 herbicides.

Local weed scientists estimate that Group B/2 resistant Starfruit in New South Wales infests 51-100 sites and the number of sites are increasing. They also estimate that there are 501-1000 acres infested with Group B/2 resistant Starfruit and the area infested is increasing.

The 'Group' letters/numbers that you see throughout this web site refer to the classification of herbicides by their mode of action. To see a full list of herbicides and HRAC herbicide classifications click here.

QUIK STATS ( last updated Jun 06, 2000 )
Common Name	Starfruit
Species	Damasonium minus
Group	ALS inhibitors (B/2)
Herbicides	bensulfuron-methyl
Location	Australia, New South Wales
Year	1994
Situation(s)	rice
Sites	51-100
Acres Infested	501-1000
Contributors	Jim Pratley, and Andrew Storrie
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NOTES ABOUT THIS BIOTYPE

AREAS FOUND

Andrew Storrie

Irrigation areas of southern NSW.

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GENERAL

Andrew Storrie

No replacement chemicals for bensulfuron.

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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse trials comparing a known susceptible Starfruit biotype with this Starfruit 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

The genetic basis of resistance for this biotype is either unknown or has not been entered in the database. If you know anything about the genetic inheritance of this biotype please update the database.

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 B/2 resistant Starfruit from New South Wales please update the database.

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HERBICIDE RESISTANT STARFRUIT GLOBALLY
#	Country	Year	Sites	Acres	Mode of Action
1.	Australia (New South Wales )	1994	51-100	501-1000	ALS inhibitors (B/2)

FACT SHEETS AND OTHER LITERATURE	Format
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Scientific Abstracts on Herbicide Resistant Damasonium minus
Rice weed control developments.
Taylor, M. 1995. Rice weed control developments. Farmers' Newsletter, Large Area. 145: 10-11.
Starfruit escapes present a real threat.
Beale, P. 1995. Starfruit escapes present a real threat. Farmers' Newsletter, Large Area. 146: 14-15.

CONTRIBUTING WEED SCIENTISTS

JIM PRATLEY	Edit
Dean, Faculty of Science & Agriculture Charles Sturt University School of Agriculture P.O. Box 588 Wagga Wagga, 2678, N.S.W. Australia Email Jim Pratley

ANDREW STORRIE	Edit
Technical Specialist Weeds NSW Department of Primary Industries Tamworth Agricultural Institute 4 Marsden Park Road Calala, 2340, New South Wales Australia Email Andrew Storrie Web : Web Site Link

Acknowledgements

Where to now?

The Herbicide Resistance Action Committee, the Weed Science Society of America, and weed scientists in New South Wales have been instrumental in providing you this information. Particular thanks is given to Jim Pratley, and Andrew Storrie for providing detailed information.

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