Abstract

Summary Herbicide activity depends upon the inherent ability of the active ingredient (AI) to interact with the target enzyme(s) and the efficiency of its delivery at the target site(s). In this paper consideration is given to the factors which influence effective target site delivery and activity of foliage and soil-applied compounds. In the case of foliage- applied herbicides, the efficiency of retention and cuticle penetration is influenced by the stage and habit of growth of the plant, leaf age and surface characteristics, the molecular and formulation features of the AI, and the environmental conditions before, during, or after spraying. These factors may influence the efficiency of uptake, translocation and metabolism of AI en route to the target sites. The action of soil-applied compounds is influenced by the physico-chemical properties of the AI, its adsorption/desorption on the clay-humus colloidal complex, and the absorption, transport and metabolism en route to the target sites. In particular t...

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