2,2-DPA resistance in Giant Parramatta Grass (Sporobolus fertilis)

Mathisa Thevar Ramasamy Thevar, S, McLaren, D, Pritchard, G, Officer, D, Bonella, J, Preston, C and Lawrie, A 2008, '2,2-DPA resistance in Giant Parramatta Grass (Sporobolus fertilis)', in R.D. van Klinken, V.A. Osten, F.D. Panetta, J.C. Scanlan (ed.) Proceedings of the 16th Australian Weeds Conference, Cairns, Qld, 18-22 May 2008, pp. 71-73.


Document type: Conference Paper
Collection: Conference Papers

Title 2,2-DPA resistance in Giant Parramatta Grass (Sporobolus fertilis)
Author(s) Mathisa Thevar Ramasamy Thevar, S
McLaren, D
Pritchard, G
Officer, D
Bonella, J
Preston, C
Lawrie, A
Year 2008
Conference name 16th Australian Weeds Conference
Conference location Cairns, Qld
Conference dates 18-22 May 2008
Proceedings title Proceedings of the 16th Australian Weeds Conference
Editor(s) R.D. van Klinken, V.A. Osten, F.D. Panetta, J.C. Scanlan
Publisher Queensland Weeds Society, Brisbane
Place of publication Australia
Start page 71
End page 73
Total pages 3
Abstract Summary 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.
Subjects Crop and Pasture Protection (Pests, Diseases and Weeds)
Keyword(s) weeds
control
Australia
congresses
ISBN 9780646488196
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