Foliar herbicide control of sticky florestina (Florestina tripteris DC.)
John McKenzie A B , Dannielle Brazier A , Shane Campbell A F , Joseph Vitelli C , Angela Anderson D and Robert Mayer EA Biosecurity Queensland, Department of Agriculture, Fisheries and Forestry, Tropical Weeds Research Centre, PO Box 187, Charters Towers, Qld 4820, Australia.
B 241 Goomeribong Road, Goomeri, Qld 4601, Australia.
C Biosecurity Queensland, Department of Agriculture, Fisheries and Forestry, EcoSciences Precinct, PO Box 267, Brisbane, Qld 4001, Australia.
D Agri-Science Queensland, Department of Agriculture, Fisheries and Forestry, Spyglass Beef Research Facility, MS 99, Charters Towers, Qld 4820, Australia.
E Maroochy Research Station, 47 Mayers Road, Nambour, Qld 4560, Australia.
F Corresponding author. Email: Shane.Campbell@daff.qld.gov.au
The Rangeland Journal 36(3) 259-265 https://doi.org/10.1071/RJ13091
Submitted: 4 September 2013 Accepted: 7 April 2014 Published: 22 May 2014
Abstract
Sticky florestina (Florestina tripteris DC.) is an annual exotic weed that has become naturalised near the townships of Tambo and Barcaldine in central western Queensland, Australia. Three experiments conducted near Barcaldine identified foliar herbicides effective in killing sticky florestina plants and in providing residual activity to reduce recruitment from the soil seed bank. An initial chemical screening experiment evaluated the efficacy of 28 herbicide treatments. The most promising herbicides were then further evaluated in two response-rate experiments. Overall, 2,4-D/picloram, aminopyralid/fluroxypyr, clopyralid, metsulfuron-methyl and triclopyr/picloram proved to be the most effective selective herbicides. Two of these, metsulfuron-methyl at 18 g active ingredient (a.i) ha–1 and 2,4-D + picloram at 900 g a.i. ha–1 + 225 g a.i. ha–1 have now been included in a minor use permit (PER11920) with the Australian Pesticides and Veterinary Medicines Authority (APVMA) for the control of sticky florestina in pasture, stock route, roadside and non-crop situations using both spot and boom-spray applications (APVMA 2010). The permit also allows the use of 2,4-D amine for the control of seedlings only.
Additional keywords: metsulfuron-methyl, picloram, rangelands, residual, triclopyr.
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