| Researcher(s) |
Linda Bailey |
|---|---|
| Year(s) | 2021 |
| Contributor | Northern Grower Alliance |
| Trial location(s) |
Pittsworth, QLD
|
To evaluate herbicide options for residual control of Phalaris paradoxa in chickpeas
The trial was conducted in a paddock sown to wheat in 2020. Cereal stubble levels were high with visual assessment indicating ~70% groundcover prior to trial initiation.
Ten treatments were applied at the start of June, and 7 days later incorporated by sowing (IBS) using a commercial single disc planter on 50 cm row spacing. The post sowing pre-emergent treatments (PSPE) were applied directly after planting. Rainfall of ~5 mm was received 3 days after IBS application with ~15mm recorded in the first week after planting/ PSPE application. Total rainfall of only ~110 mm was received in the 4 months after planting. Inspection and assessment for weed emergence was conducted at ~4-6 week intervals from early July. The trial was concluded in early November.
Chickpea establishment was assessed at 30 days after planting (30 DAP) with ~22 plants/m2 in the untreated plots. There was no apparent effect on emergence from any herbicide treatment and no visual crop effects. No weeds were present at this assessment.
Insufficient paradoxa grass emerged during the trial to allow assessment. Common sowthistle (Sonchus oleraceus) was the only weed to emerge in sufficient numbers to allow a useful evaluation of residual efficacy.
Residual common sowthistle control was assessed at both 66 and 87 DAP. Trace levels were present at 66 DAP with <1 sowthistle/10m2 in the untreated, mainly at a 2 to 5 leaf stage. Significant (and complete control) was provided by Balance + Simazine, Balance + Terbyne Xtreme and the experimental treatment. Balance alone and Outlook were the only other treatments to provide >90% control.
By 87 DAP, the untreated sowthistle population was ~0.3/m2, mainly at the large rosette stage. Balance, Balance + Simazine, Balance + Terbyne, the experimental treatment and Outlook all provided significant control and reduced populations by >98%.
Under low weed densities, the commercial standards of Balance alone or in a tank mixture with either Simazine or Terbyne Xtreme provided complete common sowthistle control of populations emerging ~5 to 10 weeks after application. Complete control was also achieved by the experimental herbicide. Outlook also provided significant levels of control of common sowthistle but does not have label claim for this weed in chickpeas. No data was generated on the residual control of paradoxa grass.
| Lead research organisation |
Northern Grower Alliance |
|---|---|
| Host research organisation | N/A |
| Trial funding source | GRDC NGA2009-002RTX |
| Related program | N/A |
| Acknowledgments | N/A |
| Other trial partners | Not specified |
| Crop type | Grain Legume: Chickpeas |
|---|---|
| Treatment type(s) |
|
| Trial type | Experimental |
| Trial design | Randomised,Replicated,Blocked |
| Sow date | Not specified |
|---|---|
| Harvest date | Not specified |
| Plot size | Not specified |
| Plot replication | Not specified |
SILO weather estimates sourced from https://www.longpaddock.qld.gov.au/silo/
Jeffrey, S.J., Carter, J.O., Moodie, K.B. and Beswick, A.R. (2001). Using spatial interpolation to construct a comprehensive archive of Australian climate data , Environmental Modelling and Software, Vol 16/4, pp 309-330. DOI: 10.1016/S1364-8152(01)00008-1.
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