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Residual Herbicides for Weed Control in Established Alfalfa (Medicago sativa) Grown for Seed

Published online by Cambridge University Press:  12 June 2017

Najib Malik ,
Garry G. Bowes  and
John Waddington
Najib Malik
Affiliation:
Agric. Can. Res. Stn., Melfort, Sask. S0E 1A0
Garry G. Bowes
Affiliation:
Agric. Can. Res. Stn., Saskatoon, Sask. S7N 0X2
John Waddington
Affiliation:
Agric. Can. Res. Stn., Swift Current, Sask. S9H 3X2
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Abstract

The long-term effect of repeated late-fall versus early-spring imazethapyr, hexazinone, terbacil, metribuzin, dichlobenil, or chlorsulfuron treatments, when applied on dormant stands of alfalfa was investigated at three sites for weed management of alfalfa grown for seed. Dichlobenil applied at 1.2 to 2.4 kg ha−1 and chlorsulfuron applied at 11 to 22 g ha−1 in fall or spring were the only herbicides to injure alfalfa at one location. Hexazinone provided the most consistent weed control of the herbicides evaluated. Average control of Canada thistle, catchweed bedstraw, dandelion, perennial sowthistle, quackgrass, Russian pigweed, and scentless chamomile was 80%. When averaged over three sites, weed control by hexazinone resulted in a 33% increase in seed yield.

Keywords

Chlorsulfuron, 2-chloro-N-[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)amino]carbonyl]benzenesulfonamidedichlobenil, 2,6-dichlorobenzonitrilehexazinone, 3-cyclohexyl-6-(dimethylamino)-1-methyl-1,3,5-triazine-2,4(1H,3H)-dioneimazethapyr, 2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-5-ethyl-3-pyridinecarboxylic acidmetribuzin, 4-amino-6-(1,1-dimethylethyl)-3-(methylthio)-1,2,4-triazin-5(4H)-oneterbacil, 5-chloro-3-(1,1-dimethylethyl)-6-methyl-2,4(1H,3H)-pyrimidinedionealfalfa, Medicago sativa L. # MEDSACanada thistle, Cirsium arvense (L.) Scop., # CIRARcatchweed bedstraw, Galium aparine L. # GALAPdandelion, Taraxacum officinale Weber in Wiggers # TAROFperennial sowthistle, Sonchus arvensis L. # SONARquackgrass, Elytrigia repens (L.) Nevski. # AGRRERussian pigweed, Axyris amaranthoides L. # AXYAMscentless chamomile, Matricaria perforata Mérat # MATINChlorsulfurondichlobenilhexazinoneimazethapyrmetribuzinterbacilweed controlseed yieldweed management
Type
Research
Information
Weed Technology , Volume 7 , Issue 2 , June 1993 , pp. 483 - 490
Copyright
Copyright © 1993 Weed Science Society of America 

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References

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