Guidelines are enclosed in text boxes throughout this guide. Guidelines cover the selection of suitable stands, and pruning methods and techniques.
For further information about this guide please contact the B.C. Ministry of Forests.
Pruning improves stand and forest values by:
Pruning is one component in a complete program of forest management. Limited financial resources and the prolonged time the investment must be carried require that management needs and objectives be clearly identified. In addition, thorough consideration of biological factors surrounding the pruning treatment will ensure that the desired effect is obtained. Consideration of operational factors helps to guarantee that the treatment will be cost-effective and that the resulting timber can be harvested and transported to a processing facility for an acceptable price. Economic factors involved in deciding whether or not to prune are discussed in the section on Economics.
(a) control of white pine blister rust is necessary to achieve a healthy, free growing stand within the free growing assessment period specified in the prescription, or
(b) stand densities that are at least 30% lower than the minimum stocking levels for that biogeoclimatic ecosystem set out in the Ministry of Forests’ publication “Establishment to Free Growing Guidebook”, as amended from time to time, are required to achieve wildlife habitat management objectives approved for the area in the forest development plan that applies to the area under the prescription.
(a) consider the result of any free growing survey carried out on the area,
(b) ensure that the prescription is adequate to achieve the future stand condition specified in the prescription,
(c) ensure that the prescription is adequate to achieve continued growth of species that are ecologically suited for the area,
(d) ensure that the prescription facilitates the protection of the soil on the area, and
(e) describe any actions required to achieve known landscape level objectives for stand structure and species composition.
A person preparing a stand management prescription must, for the area under the prescription, ensure that the prescription:
(a) contains a summary of the silviculture treatments performed on the free growing stand on the area during the period beginning 2 weeks before the last report and ending 2 weeks before the current report’s submission date under subsection (2), and
(b) specifies whether the silviculture treatment was carried out to fulfill the requirements of a management plan or an agreement under the Forest Act.
(a) is signed and sealed by a professional forester, and
(b) is submitted each year to the district manager on April 15, July 31, October 31 and January 15.
Pruning western white pine is done:
Care must be taken to remove the lower whorl which may be buried. A silviculture prescription must include first lift pruning in order to consider western white pine as a free growing component of the stand. Pruning western white pine is a two-lift system. The first lift is done when the trees are 2.5 to 4 m tall to a lift height of 1.3 m (breast height). The second lift should be done when trees are greater than 5 m. The second lift pruning for white pine is generally considered an incremental treatment and is planned using a stand management prescription. Second lift height must be a minimum of 2.5 m and leave 50% remaining live crown. Refer to the Pine Stem Rust Management in B.C. Guidebook for more information on pruning to reduce the affects of white pine blister rust (Cronartium ribicola).
In order to consider a western white pine crop tree as a free growing stem, it normally must be pruned.
Where special management areas for wildlife habitat are required in a silviculture prescription, (e.g., deer, elk, and grizzly bear), pruning must be included in the prescription if spacing densities are at least 30% lower than the minimum stocking level. Pruning is required as a free growing obligation in these areas to maintain wood quality. Guidelines for maintaining grizzly bear habitat are in Guidelines for Integrating Grizzly Bear Habitat and Silviculture in Coastal British Columbia.
Important wildlife habitat with stand densities that are 70% or less of the minimum stocking level must be pruned to meet free growing obligations.