To determine weed control products suitable for establishment of Eucalyptus globulus on a range of soil types, rainfall zones and weed spectra.
- At planting plus 24 months, with the exception of the last ranked treatment, nil control, there was no clearly discernible pattern of statistical significant difference in total stem volume production which can be attributed to increasing or decreasing application rates of the herbicide treatments applied.
- The combination of Roundup® 360 @ 3 L/ha + Gesatop @ 5 – 20 L/ha did not provide an acceptable level of weed control during the summer following treatment application.
- The combination of Roundup® 360 @ 3 L/ha + Surflan @ 2.5 – 10 L/ha + Goal @ 2.5 – 10 L/ha did provide increasing residual weed control with increasing rates.
- Gesaprim @ 8 L/ha applied alone failed to provide an acceptable level of weed control over summer. Combining Roundup® 360 with Gesaprim @ 8 L/ha in July effectively reduced January weed loading by two thirds over applying Gesaprim alone.
- Oust® applied @ 25 – 100 g/ha and the combination of Roundup® 360 @ 3 L/ha + Oust® @ 25 – 200 g/ha provided an acceptable level of weed control.
- The combination of Roundup® 360 @ 3 L/ha + Gesaprim @ 8 L/ha + Oust® @ 50 – 200 g/ha provided both effective knockdown and residual control of weeds. There was no significant advantage in increasing the Oust® rate above 100 g/ha in either the level of knockdown or length of residual control achieved.
- Atrazine + sulfometuron-methyl granules applied on their own or following the application of Roundup® 360 @ 3 L/ha provided an acceptable level of weed control at the higher sulfometuron-methyl rates of 56 – 75 g/ha a.i only.