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Weed Control
Weed control must be based on clean field selection and shallow seeding for quick and uniform emergence to obtain a good uniform stand. The mustard crop cannot be harrowed, rotary hoed, or tilled after emergence. Weeds are a serious problem in mustard production. They not only reduce yields, but weed seeds such as wild mustard, wild buckwheat and foxtail are difficult to remove and can cause severe cleaning losses and market grade reductions. Such losses reduce profits to the grower. Mustard plants are sensitive to herbicides such as 2,4-D, Banvel, and MCPA. Spray drift must be avoided.
All mustards, but especially the oriental and brown types, should be sown on fields known to be relatively free of wild mustard infestation. Wild mustard can be mechanically separated from yellow mustard with large seed but preparation is not possible with the brown and oriental mustards. Wild mustard contamination will reduce grades of mustard, resulting in severe market discounts.
Trifluralin at 0.5 to 0.75 pound a.i. per acre (1 to 1 1/2 pints E.C. per acre) is labeled for grass control and some broadleaf weed control. Trifluralin will not control wild mustard. Trifluralin must be applied prior to seeding and incorporated thoroughly in the soil for maximum effectiveness.
Select/Prism are labeled for grass control.
For more information consult the Weed Control Guide at http://www.ag.ndsu.edu/weeds/w253/w253w.htm
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