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Firewise Landscaping


Experience has shown that landscape design is one of the most important factors in a home's survival. An aggressive defensible space and fuels reduction plan can greatly increase your home's chance of survivability in a wildfire without decreasing the aesthetic value of your home.

To create an effective Firewise landscape, remember that the primary goal is fuel reduction. To this end, create defensible space zones around your home. Zone 1 is the closest to your house. Zones 2 and 3 move progressively away from your house.

Defensible Space Zoning

Zone 1: (0 - 30 feet from residence)

(0-5 feet from residence)

       All trees should be removed

       No vegetation of any kind should be present

       Consider placing decorative rock or gravel around the house

(5-30 feet from residence)

        Thin trees to a spacing of 8-10 feet between crowns

        Prune trees so that the lowest branches are 8-10 feet above the ground

        Standing dead and dead topped trees should be removed

        Dispose of all slash and dead, down trees by hauling off, chipping or piling and burning

        Mow grasses to keep them low, a maximum of 6 inches high

        Plant dispersed firesafe trees and/or shrubs, such as aspen

Zone 2: (30 - 60 feet from residence)

     Thin trees to a spacing of 8-10 feet between crowns

     Prune trees so that the lowest branches are 6-8 feet above the ground

     Remove standing dead and dead topped trees

     Dispose of most slash and dead, down trees by hauling off, chipping or piling and burning

     Small amounts of slash can be lopped and scattered for decomposition

     Plant aspen trees in open areas

Zone 3 (60 - 90 feet from residence)

     Thin trees to a spacing of 6-8 feet between crowns

     Pruning is not necessary in this zone

     Treat slash by lop-and-scatter, chipping or piling and burning

Fuel Treatment Recommendations beyond 90 feet

       Continue thinning, pruning and slash activities as recommended in Zone 3

       Remove most standing dead and dead topped trees; two per acre could be left for wildlife as long as the trees pose no threat to structures or access roads.

Insect & Disease Attack Prevention

An aggressive defensible space and fuels reduction plan will also promote healthy vegetation in the forest surrounding your home. Insect and disease attacks such as Comandra Blister Rust, Dwarf Mistletoe, and Mountain Pine Beetle can devastate an unhealthy, overgrown forest in a very short time. However, with selective fuels reduction you can promote tree health and improve growth while inhibiting the spread of insects and diseases.

Comandra Blister Rust is a disease that is caused by a fungus growing in the inner bark. The fungus has a complex life cycle. It infects lodgepole pines, but needs an alternate host, an unrelated plant to spread from one pine to another.

On lodgepole pines, the fungus causes growth reduction, stem deformity, and mortality. In addition, pines with stem cankers produce significantly fewer cones and seeds than healthy trees.

Dwarf Mistletoe is a native, parasitic, seed plant that occurs essentially throughout the range of western conifers in North America. It is the most damaging disease agent in coniferous trees, causing severe growth loss and increased tree mortality.

In the United States, the principle host of Dwarf Mistletoe is the lodgepole pine. It is occasionally found on limber and ponderosa pines, Engelmann spruce, blue spruce, whitebark pine, and Rocky Mountain bristlecone pines as well.

Abnormally tufted branches characterize affected trees. These growths, which are caused by the Dwarf Mistletoe, are called witches' brooms. Dwarf Mistletoe can cause the tree's growth to slow and eventually the crown will die. It also reduces the seed production of the host trees and can cause deformities such as cankers and knots.

Mountain Pine Beetle is a member of a group of beetles known as bark beetles. Except when the adults emerge and attack new trees, the mountain pine beetle completes its life cycle under the bark of the tree.

The beetle attacks and kills lodgepole, ponderosa, and western white pines. Outbreaks frequently develop in lodgepole pine stands that are grouped in dense stands of trees.

During epidemics, widespread tree mortality alters the forest ecosystem. Often, beetles have almost completely depleted the commercial pine forests. Moreover, the dead trees that are left after an epidemic are a source of readily ignitable fuel that will burn unless removed.

Douglas-fir Beetle is an insect that infests and kills Douglas-fir throughout most of its range in western United States. Douglas-fir beetles normal kill small groups of trees, but during outbreaks hundreds of infected tree groups are not uncommon. Losses can be devastating during periodic outbreaks.

At low or endemic levels, the beetle infests scattered trees, including windfalls and trees injured by fire, defoliation, or root disease. Where such susceptible trees are abundant, once they have been infested and killed, beetle populations can build up rapidly and spread to adjacent green, standing trees.

305 South Smith Road Riverton, WY 82501
(307) 857-3030 Fax: (307) 856-2648