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Imazethapyr, Alone or with Other Herbicides for Weed Control During Alfalfa (Medicago sativa) Establishment

Published online by Cambridge University Press:  12 June 2017

A. Lloyd Darwent ,
Dan Cole  and
Najib Malik
A. Lloyd Darwent
Affiliation:
Northern Agricultural Research Centre, Agriculture and Agri-Food Canada, Beaverlodge, AB T0U 0C0
Dan Cole
Affiliation:
Alberta Agriculture, Food and Rural Development Agronomy Unit, Edmonton, AB T6H 4P2
Najib Malik
Affiliation:
Pest Management Regulatory Agency, Nepean, ON K1A 0Y9
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Abstract

During the establishment of alfalfa, POST applications of imazethapyr at 50 g/ha, following PPI applications of trifluralin at 1,100 g/ha, consistently provided ≥ 80% control of wild oat, volunteer canola, and shepherd's-purse with no crop injury. POST applications of the same rate of imazethapyr without PPI applications of trifluralin provided similar volunteer canola and shepherd's-purse control, but ≥ 80% wild oat control was achieved only 25% of the time. Imazethapyr, alone or following trifluralin, did not control common groundsel. Broadleaf weed control from imazethapyr at 50 g/ha tank mixed with fluazifop-P at 125 g/ha or sethoxydim at 200 g/ha was not reduced compared to imazethapyr alone. However, the probability of controlling wild oat by ≥ 90% was reduced from 83% to 0 when the same rate of imazethapyr was tank mixed with fluazifop-P, compared to fluazifop-P alone. Tank mixtures of imazethapyr at 50 g/ha and sethoxydim controlled wild oat only slightly less than sethoxydim alone. First cut and total herbage yields, obtained 1 yr after alfalfa establishment, increased where treatments effectively controlled broadleaf weeds and wild oat, compared to check plots. Second cut herbage and seed yields, also obtained 1 yr after alfalfa establishment, were not affected by any of the treatments.

Keywords

Fluazifop-P, (R)-2-[4-[[5-(trifluoromethyl)-2-pyridinyl]oxy]phenoxy]propanoic acidimazethapyr, 2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-5-ethyl-3-pyridinecarboxylic acidsethoxydim, 2-[1-(ethoxyimino)butyl]-5-[2-ethylthio)propyl]-3-hydroxy-2-cyclohexen-1-onetrifluralin, 2,6-dinitro-N,N-dipropyl-4-(trifluoromethyl)benzenaminecommon groundsel, Senecio vulgaris L. # SENVUshepherd's-purse, Capsella bursa-pastoris (L.) Medicus # CAPBPvolunteer canola, Brassica rapa L. # BRSRAwild oat, Avena fatua L. # AVEFAalfalfa, Medicago sativa L. ‘Peace.'Graminicidesreduced herbicide ratesAVEFABRSRACAPBPSENVU
Type
Research
Information
Weed Technology , Volume 11 , Issue 2 , June 1997 , pp. 346 - 353
Copyright
Copyright © 1997 by the Weed Science Society of America 

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References

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