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Mode of Action - Phenoxy

Phenoxy mode of action

Phenoxy herbicides mimic the plant growth regulator indol-3- acetic acid (IAA), or auxin in plants.

Auxin is a plant growth regulator that controls cell enlargement, division and plant development through the plant life cycle.

Phenoxy herbicides work by binding to some or all of the same sites in the plant cells as naturally occurring IAA.

While naturally occurring IAA concentrations in the cell are highly regulated, when phenoxy herbicides are applied, plant growth becomes deregulated.

This causes twisting, thickening and elongation of leaves and stems and eventually leads to plant death as the plant cannot mobilise reserves, repair or function properly.

Photo: M.Slatter

Volunteer canola in a fallow situation, showing typical phenoxy symptoms.

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