In search of new herbicide chemistries for the prairies
Date
2006-03-02
Authors
Johnson, E.N.
Ulrich, D.A.
Blackshaw, R.E.
May, W.E.
Sapsford, K.L.
Holm, F.A.
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Abstract
There are a limited of herbicide groups for use in western Canada so there is a need
introduce different modes of action to manage herbicide resistant weeds. In addition,
many broadleaf crops such as chickpea have limited broadleaf weed control options.
Sulfentrazone, a Group 14 PPO inhibitor has been screened in a number of broadleaf
crops. Chickpea has exhibited excellent tolerance to sulfentrazone, while the tolerance of other broadleaf crops can be summarized as follows: sunflower and fababean (fair to good); field pea, and narrow-leaved lupin (fair); dry bean (poor) and lentil (very poor). Isoxaflutole is a Group 27 carotenoid biosynthesis inhibitor that may have potential for use in chickpea, tame buckwheat, and narrow-leaved lupin. Sulfentrazone effectively controls many broadleaf weeds but is weak on cruciferous weeds such as wild mustard. Isoxaflutole also controls a number of broadleaf weeds but does not control wild buckwheat. Both sulfentrazone and isoxaflutole are soil-applied herbicides with potential to carry-over and injure rotational crops. Preliminary results from field trials indicate that combined low rates of sulfentrazone and isoxaflutole can result in excellent broad spectrum weed control in chickpea. Carfentrazone-ethyl, a contact non-residual PPO inhibitor has been shown to be an effective pre-seed burndown partner for glyphosate. This would allow for the control of volunteer Roundup-ready canola prior to the seeding of broadleaf crops.
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herbicides, pulse crops, ppo inhibitors, carotenoid biosynthesis inhibitors
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Soils and Crops Workshop