Another glyphosate resistance first in Australia

The world's first incidence of resistance to the herbicide, glyphosate, in sweet summer grass (Brachiara eruciformis) has been reported in Australia by the Australian Glyphosate Sustainability Working Group (AGSWG). The resistant population was discovered by staff from the Queensland Department of Agriculture, Fisheries and Forestry after it survived several applications of glyphosate at the recommended rate. It occurred on a farm that had been practising zero tillage since the 1990s, with at least 20 years of continuous glyphosate use. The AGSWG is supported by a range of industry organisations, including the Grains Research and Development Corporation, which highlighted the latest resistance incident. The world's first case of glyphosate-resistant sowthistle (Sonchus spp) was found in Australia earlier this year (Agrow No 684, p 23).