Residual Control of Feathertop Rhodes Grass in Wheat - St Ruth

2020
CC BY 4.0

Research organisaton
Funding source

Trial details

Researcher(s) Linda Bailey
Year(s) 2020
Contributor Northern Grower Alliance
Trial location(s) St Ruth, QLD
Residual Control of Feathertop Rhodes Grass in Wheat - St Ruth locations
Aims

To evaluate herbicides for the residual control of spring germinating Feathertop Rhodes grass.

Key messages
Not specified
St Ruth QLD 2020

This trial was established to evaluate the residual control of Feathertop Rhodes (FTR) grass in wheat. The treatments planned for incorporation by sowing (IBS) were applied 2 days after planting (DAP) and incorporated with chains (IBC) dragged behind the planting units. The post sowing pre-emergent treatments (PSPE) were applied immediately after the incorporation. The in-crop application was applied at 33DAP when ~90% of the crop was at GS21-22 but pre-emergent to weeds. Wheat establishment counts were taken at 26DAP, with no impact on emergence apparent from any treatment. The FTR emergence commenced in late October, following a total of ~46mm between the 19th and 29th of October (119-129DAA). Weed counts were undertaken at 133DAA when the FTR was at a 2-leaf stage. The majority of treatments provided >90% control of a FTR population of ~2/m2 . Sakura, Luximax, Overwatch, and Diablo Duo provided ~80-85 control. Arcade or Boxer Gold, both applied at planting, were disappointing with large variability between replicates for Boxer Gold in particular. All treatments except Luximax and Dual Gold provided significant control of a pigweed population of ~5-6/m2 . There were no significant differences in low and variable level populations of bladder ketmia. The wheat crop was harvested the following day. There was no further emergence of FTR, however counts of stink grass, pigweed and bladder ketmia were taken in January 2021 at 214DAA. Significant differences were found in pigweed counts with Luximax, Dual Gold and Overwatch significantly poorer than the best treatments. No significant differences were found in low and variable level populations of stink grass or bladder ketmia. 

Lead research organisation Northern Grower Alliance
Host research organisation N/A
Trial funding source GRDC NGA2009-001RTX
Related program N/A
Acknowledgments N/A
Other trial partners Not specified
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Trial report and links

2020 trial report



Trial last modified: 31-01-2023 15:50pm AEST