NOMENCLATURE Common name clopyralid (BSI, ANSI, draft E-ISO, (m) draft F-ISO); 3,6-dichloropicolinic acid (WSSA, Canada, Finland and, until 1984, BSI; name accepted in lieu of a common name); acide dichloro-3,6 picolinique (France and, until 1984, F-ISO; name accepted in lieu of a common name) IUPAC name 3,6-dichloropyridine-2-carboxylic acid Chemical Abstracts name 3,6-dichloro-2-pyridinecarboxylic acid CAS RN [1702-17-6] EEC no. 216-935-4


Selective systemic herbicide, absorbed by the leaves and roots, with translocation both acropetally and basipetally, and accumulation in meristematic tissue. Exhibits an auxin-type reaction. Acts on cell elongation and respiration.


Post-emergence control of many annual and perennial broad-leaved weeds of the families Polygonaceae, Compositae, Leguminosae, and Umbelliferae, in sugar beet, fodder beet, oilseed rape, maize, brassicas, onions, leeks, strawberries, flax and grassland. Provides particularly good control of creeping thistle (Cirsium arvense), perennial sow-thistle, coltsfoot, mayweeds, and Polygonum spp.

Production formulation

Clopyralid 30%SC
Clopyralid 30%SL