Long-term seed bank management of wild oats in southern New South Wales

Wild oats (Avena spp.) are one of the most important winter weeds in Australia and in the world. They are prevalent across the northern and southern cropping regions of New South Wales. Wild oats can cause significant yield reductions to crops due to its competitiveness and allelopathic effects. Rapid development of herbicide resistance in wild oats has complicated the management of this weed. Wild oat populations persist well under current farming practices because of the replenishment of wild oat seeds from late germinating cohorts of seeds. A four-year field study was established to investigate the impacts of non-chemical and chemical options with rotational crops on wild oat seed bank dynamics. The results showed that pre-emergent (PRE) only treatments were not effective in reducing the soil seed bank. Significant seed bank reduction can be achieved by the combination of PRE + post emergent (POST) treatment or PRE + POST + Seed Catching. This study also showed that seed catching did not contribute significantly to further reduce the wild oat seed bank as wild oat seeds are often shed prior to harvest. It will require at least three years of dedicated efforts to successfully manage wild oats populations.


Cite this article as:

Wu, H. and Koetz, E. (2014). Long-term seed bank management of wild oats in southern New South Wales. Plant Protection Quarterly 29(4), 143-146.


 

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First published online: December 31, 2014