<b>HRAC Group 0</b> <font size='2'> (Legacy Z) </font> resistant Sporobolus fertilis from Australia, New South Wales

International Survey of Herbicide-Resistant Weeds

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Thursday, November 21, 2024

HRAC GROUP 0 (LEGACY Z) RESISTANT GIANT PARRAMATTA GRASS
(Sporobolus fertilis)

UnknownHRAC Group 0 (Legacy Z)

Australia, New South Wales

INTRODUCTION		GIANT PARRAMATTA GRASS
Giant Parramatta grass (Sporobolus fertilis) is a monocot weed in the Poaceae family. In New South Wales this weed first evolved resistance to Group 0 (Legacy Z) herbicides in 2004 and infests Pastures. Group 0 (Legacy Z) herbicides are known as Unknown (Unknown). Research has shown that these particular biotypes are resistant to dalapon, and flupropanate and they may be cross-resistant to other Group 0 (Legacy Z) 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 Feb 03, 2015 )
Common Name	Giant Parramatta grass
Species	Sporobolus fertilis
Group	Unknown HRAC Group 0 (Legacy Z)
Herbicides	dalapon, and flupropanate
Location	Australia, New South Wales
Year	2004
Situation(s)	Pastures
Contributors - (Alphabetically)	David Officer
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NOTES ABOUT THIS BIOTYPE

GENERAL

David Officer

Ramasamy, S., Pritchard, G., Officer, D., Preston, C., Lawrie, A. C., McLaren, D.A. and Bonilla, J. (2007). Flupropanate Resistance in Giant Parramatta Grass (Sporobolus fertilis). Proc. of Resistance 2007 [Abstract Book]. 16th-18th April Rothamsted Research, Hertfordshire, UK pp.53.

Ramasamy, S., McLaren D.A., Pritchard, G., Officer, D., Bonilla, J., Preston, C. and Lawrie, A.C. (2008). 2, 2 DPA resistance in Giant Parramatta Grass (Sporobolus fertilis). Proceedings of the 16^th Australian Weeds Conference, eds R.D. van Klinken, R.D., V.A. Osten, F.D. Panetta and J.C. Scanlan. (Queensland Weeds Society, Brisbane) pp. 71-73.

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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse trials comparing a known susceptible Giant Parramatta grass biotype with this Giant Parramatta grass 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 0 resistant Giant Parramatta grass 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 0 (Legacy Z) resistant Giant Parramatta grass from New South Wales please update the database.

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CONTRIBUTING WEED SCIENTISTS

DAVID OFFICER

Weed Scientist NSW Department of Primary Industries, PMB 2 Grafton , 2480, New South Wales Australia Email David Officer

ACKNOWLEDGEMENTS
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 David Officer for providing detailed information.

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Herbicide Resistant Giant Parramatta grass Globally
(Sporobolus fertilis)

Country

FirstYear

Situation

Active Ingredients

Site of Action

Australia (New South Wales )

2004

Pastures

dalapon, and flupropanate

Unknown ( HRAC Group 0 (Legacy Z)

Literature about Similar Cases

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Ramasamy, S. ; McLaren, D. A. ; Pritchard, G. ; Officer, D. ; Bonilla, J. ; Preston, C. ; Lawrie, A. C.. 2008. 2,2-DPA resistance in giant Parramatta grass (Sporobolus fertilis). : 71 - 73.

Sporobolus fertilis seeds suspected of being resistant to 2,2-DPA (sodium 2,2-dichloropropionate) were collected near Grafton, NSW, Australia. A seedling Petri-dish assay showed that the 2,2-DPA concentration required to reduce shoot length by 50% in the resistant biotype was about 500 g a.i. kg^-1, five times greater than that for the sensitive biotype. Similarly, a pot-dose assessment in plants showed that the resistant population required 4 and 28 kg a.i. ha^-1 for 50% reductions in shoot height and the proportion of live leaves per plant respectively, more than 2.5 and 14 times the recommended rate, whereas the sensitive plants were well controlled by the recommended rate. This shows that 2,2-DPA resistance has indeed developed in the field and will limit the use of 2,2-DPA for the control of S. fertilis in future..

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