Mode of Action: Picloram is an “auxin mimic” or synthetic auxin. This type of herbicide kills susceptible plants by mimicking the plant growth hormone auxin (indole acetic acid), and when administered at effective doses, causes uncontrolled and disorganized plant growth that leads to plant death.

Will picloram kill trees?

Picloram is absorbed through the foliage and roots of plants and will severely injure or kill trees if applied within their root zone. At rates applied for brush control, picloram may have a residual effectiveness of a year or more in most soils.

Is picloram systemic?

Picloram is a systemic herbicide used to control deeply rooted herbaceous weeds and woody plants in rights-of-way, forestry, rangelands, pastures, and small grain crops. It is applied in the greatest amounts to pasture and rangeland, followed by forestry.