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Canola (Brassica napus) Response to Simulated Sprayer Contamination with Thifensulfuron and Thifensulfuron:Tribenuron (2:1)

Published online by Cambridge University Press:  12 June 2017

David A. Wall ,
Douglas A. Derksen  and
Lyle F. Friesen
David A. Wall
Affiliation:
Agric. and Agri-Food Canada, Unit 100–101, Route 100, Morden, MB, R6M 1Y5
Douglas A. Derksen
Affiliation:
Agric. and Agri-Food Canada, Box 760, Indian Head, SK, SOG 2K0
Lyle F. Friesen
Affiliation:
Dep. of Plant Sci., Univ. of Manitoba, Winnipeg, MB, R3T 2N2
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Abstract

Greenhouse and field studies were conducted in 1992 and 1993 in Manitoba and Saskatchewan to determine the effect of simulated sprayer contamination with thifensulfuron and thifensulfuron:tribenuron (2:1) on canola. In greenhouse studies, canola was more sensitive to tribenuron and thifensulfuron:tribenuron (2:1) than thifensulfuron. Thifensulfuron was more phytotoxic to canola when applied with Merge (50% surfactant blend and 50% petroleum hydrocarbon solvents) than with Agral 90 (non-ionic spreader and activator) at recommended adjuvant concentrations {1% and 0.2% (v/v), respectively}. In the field, canola injury tended to be more severe when thifensulfuron was applied with Merge than with Agral 90, but yields did not differ significantly between adjuvants, Thifensulfuron and thifensulfuron:tribenuron (2:1) at rates as low as 0.1 g ai/ha severely injured canola, delayed flowering, and reduced yield and subsequent seed germination. Thifensulfuron at 0.1 to 0.15 g/ha in mixtures with sethoxydim plus Merge reduced yields up to 61%.

Keywords

Sethoxydim, 2-[1-(ethoxyimino)butyl]-5-[2-(ethylthio)propyl]-3-hydroxy-2-cyclohexen-1-onethifensulfuron, 3-[[[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)amino]carbonyl]amino]sulfonyl]-2-thiophenecarboxylic acidtribenuron, 2-[[[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)methylamino]carbonyl]amino]sulfonyl]benzoic acidcanola, Brassica napus L. ‘AC Excel,’ ‘Legend.’Adjuvantdose responseflowering delayherbicide injuryresiduessublethal ratesspray driftyield losses
Type
Research
Information
Weed Technology , Volume 9 , Issue 3 , September 1995 , pp. 468 - 476
Copyright
Copyright © 1995 by the Weed Science Society of America 

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