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Banvel / dicamba

Chemical Structure

Chemical Name:

3,6-dichloro-2-methoxybenzoic acid.

Chemical Family:

Benzoic acids.

WSSA Resistance Group:


Crop/non-crop registration:

Corn, wheat, barley, rye, oats, turf, utility rights-of-way

Sensitive weeds:

Annual, biennial, perennial BLW (broadleaf weeds); brush species; conifers; especially velvetleaf, Canada thistle, field bindweed & various triazine-resistant BLW.

Application method:

PRE and POST in corn (POST only for others).

Absorption & Translocation:

Readily absorbed by roots, stems, foliage and then translocated to other plant parts. Moves both through xylem and phloem (apoplast and symplast).

Mode of Action:

Disruption of transport systems and interference with nucleic acid metabolism.

Metabolic pathway inhibited:

Not completely understood;but similar to that of the endogenous auxin: indole acetic acid (IAA); specific site of action has not yet been identified.

Basis of Selectivity:

Metabolized to non-toxic compounds by tolerant species.


Induces abnormal growth typical of growth-hormone herbicides ('epinastic bending'). Twisting, bending of stems and petioles; leaf curling and cupping and development of abnormal tissues and secondary roots. Plant death occurs from growth abnormalities - symptoms occur within hrs of application but death is a slow process: 3-5 wks.


Intermediate (1-4 months); no problem in subsequent season if applied at recommended rates.


Oral LD50 = 1707 mg/kg - moderately toxic (BANVEL = 2629 mg/kg- slightly toxic).

Additional comments:

Control is best when weeds are small and actively growing; high rainfall or cold temperatures after application may cause temporary corn injury, especially early in season; spray drift may be a problem, especially at high temperatures [>25C (75F)]; often tank-mixed with grass herbicides/or phenoxys to increase spectrum of control.