Between March and April 2017 near Corrigin Western Australia, a trial was conducted using various glyphosate formulations and phenoxy mixes.
Table 1; Treatment list
The purpose of the trial was to investigate various glyphosate formulations, and the effect of Group I spikes on overall efficacy on summer fallow weeds. This work was initiated due to an increase in grower interest relating to the field effects of the various glyphosate formulations under summer fallow conditions.
Table 2; Control of mintweed, Prickly paddy melon and volunteer barley 35 DAT (% Brownout)
Means within the same cell with a letter in common are not significantly different (P>0.05)Means within the same cell with a letter in common are not significantly different (P>0.05)Ana – Analysis not applicable
The trial results indicated that;
- No Glyphosate formulation provided better control than any other
- Adding 2, 4-D to Glyphosate + Triclopyr improved the speed of brownout on prickly paddy melon compared the Triclopyr/Glyphosate alone, although both controlled melons by 35 DAT
- Adding 2, 4-D to Glyphosate + Triclopyr brews antagonised Glyphosate control of volunteer barley• Sharpen did not affect glyphosate efficacy on barley
- Paraquat + Triclopyr and Glyphosate + Sharpen did not control prickly paddy melon.
- Some volunteer barley re-grew following Paraquat application
- Everything controlled Mintweed