Looking beyond Glyphosate for Site-Specific Fallow Weed Control in Australian Grain Production

Summer annual weed species in northern Australian summer fallows are frequently present at low densities and, increasingly, glyphosate-resistant, creating the need for alternative herbicides site-specific control. Alternative non-selective herbicide treatments effective on problematic fallow weeds; however, many yet to be evaluated as (spot spraying) treatments. This study aimed identify that could used place of glyphosate control larger/mature Chloris virgata and Sonchus oleraceus plants. The response these 12 was pot experiments conducted over summer/autumn 2022. Despite not being consistently across both species, there were instances where achieved by some S. controlled (i.e., ≤10% plant survival) glufosinate-ammonium, paraquat also with protoporphyrinogen-oxidase (PPO)-inhibiting saflufenacil, tiafenacil trifludimoxazin. However, results consistent repeated studies or C. virgata. Glyphosate only A replacement a spot-spraying treatment identified, until further more successful, approaches needed preserve ongoing effectiveness this herbicide.