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Postemergence Control of Weeds in Winter Rapeseed, Brassica napus, by DPX-A7881

Published online by Cambridge University Press:  12 June 2017

Finlay S. Buchanan ,
Clarence J. Swanton  and
Terry J. Gillespie
Finlay S. Buchanan
Affiliation:
Dep. Crop Sci., Univ. Guelph, Guelph, Ontario, Canada N1G 2W1
Clarence J. Swanton
Affiliation:
Dep. Crop Sci., Univ. Guelph, Guelph, Ontario, Canada N1G 2W1
Terry J. Gillespie
Affiliation:
Dep. Land Resource Sci., Univ. Guelph, Guelph, Ontario, Canada N1G 2W1
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Abstract

Field experiments were established to determine the dose and timing of DPX-A7881 applied postemergence for control of weeds in winter rapeseed. Wild mustard and shepherdspurse were effectively controlled by DPX-A7881. Control of these weeds by DPX-A7881 was dependent upon growth stage. The later the growth stage at time of herbicide application the poorer the control. Fall applications of DPX-A7881 provided greater control of wild mustard and shepherdspurse seedlings compared to spring applications. The 0.010 kg ai ha-1 dose was as effective in controlling susceptible weed species as 0.030 kg ai ha-1. Control of common lambsquarters and redroot pigweed by DPX-A7881 was poor. Regardless of timing or amount of herbicide applied, DPX-A7881 did not significantly reduce dry weights of either barnyardgrass or green foxtail. Doses of DPX-A7881 ranging from 0.010 to 0.030 kg ai ha-1 did not injure or adversely affect winter survival of rapeseed seedlings. Rapeseed yield and seed quality were not affected by DPX-A7881 applied postemergence.

Keywords

DPX-A7881, methyl 2-[[[[[4-ethoxy-6-methylamino-1,3,5-triazin-2-yl]amino]carbonyl]amino]sulfonyl]benzoaterapeseed, Brassica napus (L.) ‘Tandem’wild mustard, Sinapis arvensis (L.) # SINARshepherdspurse, Capsella bursa-pastoris (L.) Medik. # CAPBPcommon lambsquarters, Chenopodium album (L.) # CHEALredroot pigweed, Amaranthus retroflexus (L.) AMAREbarnyardgrass, Echinochloa crus-galli (L.) Beauv. # ECHCGgreen foxtail, Setaria viridis (L.) Beauv. # SETVIWeed controlyieldseed qualitytotal glucosinolates4-hydroxybenzyl glucosinolateSinapis arvensisCapsella bursa-pastorisChenopodium albumAmaranthus retroflexusEchinochloa crus-galliSetaria viridusSINARCAPBPCHEALAMAREECHCGSETVI
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 38 , Issue 4-5 , September 1990 , pp. 389 - 395
Copyright
Copyright © 1990 by the Weed Science Society of America 

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References

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