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Effect of 2,4-D and Dicamba Residues on Following Crops in Conservation Tillage Systems

Published online by Cambridge University Press:  12 June 2017

James R. Moyer ,
Peter Bergen  and
G. Bruce Schaalje
James R. Moyer
Affiliation:
Lethbridge, AB T1J 4B1, Canada, and Weed Sci. Alberta Sugar Co., Box 1209, Taber, AB T0K 2G0, Canada
Peter Bergen
Affiliation:
Lethbridge, AB T1J 4B1, Canada, and Weed Sci. Alberta Sugar Co., Box 1209, Taber, AB T0K 2G0, Canada
G. Bruce Schaalje
Affiliation:
Lethbridge, AB T1J 4B1, Canada, and Weed Sci. Alberta Sugar Co., Box 1209, Taber, AB T0K 2G0, Canada
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Abstract

Dicamba and 2,4-D, which are used prior to seeding in conservation tillage systems, were applied in late fall and early spring to determine their residual effect on subsequent spring-seeded crops. The herbicides 2,4-D ester and 2,4-D amine with dicamba or glyphosate, applied 0 or 15 d prior to spring seeding, damaged canola, peas, lentils, and alfalfa. The legumes were damaged by spring-applied dicamba. There was also a slight reduction in the total dry matter yield of wheat and barley by 2,4-D applied in spring prior to seeding. All crops tested, except lentils, were tolerant of recommended fall applications of 2,4-D for the control of winter annual flixweed and field pennycress.

Keywords

Dicamba, 3,6-dichloro-2-methoxybenzoic acid2,4-D, (2,4-dichlorophenoxy)acetic acidglyphosate, N-(phosphonomethyl)glycineflixweed, Descurainia sophia (L.) Webb. ex Prantl ♯ DESSOfield pennycress, Thlaspi arvense L. ♯ THLARalfalfa, Medicago sativa L. ‘Beaver’canola, Brassica napus L. ‘Pivot’lentil, Lens culinaris Medik ‘Laird’peas, Pisum sativum L. ‘Century’wheat, Triticum aestivum L. ‘Katepwa’Degradationphenoxyalkanoic acid herbicidebenzoic acid herbicideglyphosatealfalfacanolalentilpeasDESSOTHLAR
Type
Research
Information
Weed Technology , Volume 6 , Issue 1 , March 1992 , pp. 149 - 155
Copyright
Copyright © 1990 by the Weed Science Society of America 

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