Abstract
Herbicides are an important component of modem agricultural production systems and are widely used to restrict the losses from weeds. The herbicide clopyralid (3,6-dichloropyridine-2-carboxylic acid) was introduced in the mid 197 0's as a broad-spectrum herbicide for selective control of weeds in crops such as sugar beet, fodder beet, maize, brassicas, cereals, strawberries as well as pastures (Haagsma, 1975; Naish, 1975; Rutherford and Lobb, 1979). In New Zealand, it is currently registered for the control of certain broadleaf weeds in a range of crops, turf and amenity are as, pastures, forestry, as well as for conservation tillage (Hathway, 1989; O'Connor, 2002).
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