The impact of herbicide residues on selected tolerant and susceptible crop and pasture species

Authors: Brian Dzoma¹, Nigel Wilhelm² and Kym Zeppel¹

¹SARDI Loxton Research Centre, ²SARDI Waite Research Precinct

Funded By: Grains Research and Development Corporation (DAS00169)

Peer Review: Sjaan Davey (SARDI – Waite) and Brett Masters (Rural Solutions – Port Lincoln)

Project Title: Improving sustainable productivity and profitability of Mallee farming systems with a focus on soil improvements)

Key Words: herbicide residues, herbicide tolerance

Key Messages

• Conventional crop and pasture species can suffer significant damage from carryover herbicides
• Non-herbicide tolerant lentil varieties are susceptible to very low levels of imidazolinones and sulfonylurea herbicide residues
• Significant losses can occur in non-Clearfield wheat varieties grown in soils with low levels of carryover Intervix
• Field peas and vetch have zero tolerance to Lontrel herbicide residues
• To avoid crop damage and losses, minimum re-cropping intervals (months after application) should be observed, and growers should be wary of unusual or extreme weather conditions.