Weed Technology (2023) 37, 95-99

Gulshan Mahajan and Bhagirath Singh Chauhan (2023)
Herbicide options for sterile oats (Avena ludoviciana) control in winter-planted sorghum
Weed Technology 37 (1), 95-99
Abstract: Australian grain growers are showing interest in winter-planted sorghum to avoid heat and water stress during the grain-filling stage. Winter-planted sorghum may face competition from winter weeds, including sterile oats, and no herbicides are registered for controlling winter weeds in winter-planted sorghum. The objectives of this study were to (1) identify alternate herbicide options for sterile oats control in winter-sown imidazolinone (IMI)-resistant sorghum and (2) assess the crop injury levels due to herbicides. Sterile oats control with pendimethalin at 0.59 kg ai ha–¹, trifluralin at 0.38 kg ai ha–¹, and prosulfocarb + S-metolachlor at 2.3 kg ai ha–¹ was poor (<30%). Atrazine at 2.7 kg ai ha–¹, imazamox + imazapyr at 0.048 kg ai ha–¹, and atrazine at 2.7 kg ai ha–¹ followed by imazamox + imazapyr at 0.048 kg ai ha–¹ reduced the sterile oats biomass by 93%, 96%, and 100% and increased yields by 116%, 136%, and 140%, respectively, compared with nontreated control. Pendimethalin at 0.59 kg ai ha–¹ and trifluralin at 0.38 kg ai ha–¹ caused phytotoxicity to the crop and gave similar yields to nontreated control. Triallate at 0.8 kg ai ha–¹, pyroxasulfone at 0.1 kg ai ha–¹, and terbuthylazine at 1.0 kg ai ha–¹ provided moderate weed control (44% to 65%) and increased yields by 68%, 108%, and 80%, respectively, compared with nontreated control. This research identified herbicide treatments for the effective control of sterile oats in winter-sown IMI-resistant sorghum that could be used in rotations to reduce the reliance on single herbicide treatments.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Bhagirath Singh Chauhan

Research topic(s) for pests/diseases/weeds:
control - general

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Avena sterilis (weed)	Sorghum (crop)	Australia (NT+QLD)