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4 Application of Herbicides

For vegetation control through chemical means to be effective, the herbicides must be absorbed into plants (via leaves, stems, twigs, or roots) and subsequently translocated (in the case of systemic herbicides) to the site of action in appropriate form and quantity. Herbicide absorption is influenced by several factors:

  • herbicide formulation,
  • carrier and orientation,
  • chemical composition of plant surfaces, and
  • weather conditions (particularly temperature and relative humidity).

Translocation is controlled by two sets of factors:

  • the inherent properties of the herbicide; and
  • plant phenology and condition (e.g., plant vigor, water or drought stress, and damaged plant parts).

Effective vegetation control requires appropriate selection of the following:

  • herbicide formulation,
  • carriers,
  • application rate and spray volume,
  • application season and local weather conditions,
  • application method,
  • and supervision.

Otchere-Boateng and Herring [in Lavender et al., 1990] briefly discuss each factor. Detailed information is available in the Handbook for Pesticide Applicators and Dispensers: Forestry Supplement [MOF 1991] and FRDA Handbooks 005 and 006.


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Copyright 1999 Province of British Columbia
Forest Practices Branch
BC Ministry of Forests
This page was last updated December 1993

Comments to: Tim Ebata <Tim.Ebata@gems8.gov.bc.ca>