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Catalogue: GRDC Updates
Ryegrass and sow thistle were evaluated in this project; other weeds such as wild oats, wild radish, mustards, poppy, etc. are also developing resistance in this region... The aim of the project was to capture the current resistance status of a large sample of ryegrass and sow thistle; to key pre-emergent and post emergent herbicides in the western riverina region of SW NSW... What was very interesting was the level of resistance measured in samples with no expected resistance...
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Catalogue: GRDC Updates (West)
The cross resistance profile to pre-emergence herbicides has been examined in a multi-resistant population of annual ryegrass after pyroxasulfone recurrent selection... Recurrent selection with pyroxasulfone at below-label doses has resulted in pyroxasulfone resistance and cross-resistance to prosulfocarb and triallate... We suggest that herbicide rotation at the full label rate of prosulfocarb, pyroxasulfone, triallate and trifluralin in conjunction with weed seed control at harvest is currently the most sustainable solution for pre-emergence herbicide control of annual ryegrass in cereals...
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