THE tentacles of herbicide resistance continue to spread throughout NSW cropping regions as the list of chemicals losing their impact on weeds steadily grows.
Resistance is now common in annual ryegrasses in most cropping regions of southern Australia.
There are 103 confirmed sites with glyphosate-resistant annual ryegrass in Australia with an increasing number of sites along fence lines and other uncropped areas of farms.
Herbicide resistance is also widespread in wild oats and brome grass.
Speaking at the Grains Research and Development Corporation Update in Wagga Wagga, University of Adelaide’s Dr Chris Preston said surveys in southern NSW indicated there was substantial resistance to the Group A fop and Group B sulfonylurea herbicides.
Dr Preston said there was also evidence of increasing resistance to the post-emergent herbicide, Select – an important herbicide for the control of ryegrass in canola and pulse crops.
Read the full story in The Land March 4.
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