Picloram (restricted-use herbicide)

Trade name(s) Tordon 22K, Tordon K

Manufacturer(s) Corteva

Formulation(s) 2 lb/gal water-soluble concentrate

Remarks A highly translocated, selective herbicide active through both foliage and roots on many broadleaf herbaceous weeds and woody plants. Picloram is persistent; diligently follow precautions to avoid injuring desirable plants. Unmetabolized picloram in treated foliage will pass through livestock, and manure and urine can be toxic to plants.

Water solubility 430 ppm

Storage conditions Stable

Acute toxicity LD50 - 8,200 mg/kg

Action in plant Mimics natural plant hormones.

Site of action Group 4: synthetic auxin

Chemical family Pyridine

Koc Average is 16 mL/g for the K salt, but ranges from 17 to 160 mL/g