. Chemical control of brush in ponderosa pine forests of central Oregon. Brush Control Oregon; Ponderosa pine Oregon. Figure 2. — Suppressed ponderosa pine growing very slowly be- neath manzanita. 2, 4, 5 - T can be used to release such seedlings from overtopping man- zanita without serious damage to trees. Snowbrush, intermediate in shade tolerance between manzanita and chinka- pin, is often associated with manzanita in open situations but is also able to grow as an understory shrub beneath well-stocked pine stands. Consequently it prob- ably competes with the pines in an important way for so
. Chemical control of brush in ponderosa pine forests of central Oregon. Brush Control Oregon; Ponderosa pine Oregon. Figure 2. — Suppressed ponderosa pine growing very slowly be- neath manzanita. 2, 4, 5 - T can be used to release such seedlings from overtopping man- zanita without serious damage to trees. Snowbrush, intermediate in shade tolerance between manzanita and chinka- pin, is often associated with manzanita in open situations but is also able to grow as an understory shrub beneath well-stocked pine stands. Consequently it prob- ably competes with the pines in an important way for soil moisture. In managed stands, it may be necessary to use direct brush control if trees are to be grown at the low stand densities required for fast individual tree growth. Chinkapin is usually found in the more moist parts of the ponderosa pine zone, especially on north slopes or at higher elevations. A high tolerance for shade and an ability to grow in an understory position indicate chinkapin probably is an aggressive competitor for soil moisture. Manzanita does not sprout following death of aerial parts, but snowbrush and chinkapin do. Snowbrush sprouts have overtaken and crowded out trees planted following a burn. Chinkapin sprouts also grow rapidly and probably have the potential to overtake and crowd out planted trees. Central Oregon forest managers need brush control to accomplish the following objectives: 1. Prepare brushfields for planting or seeding. 2. Release existing trees from overtopping brush. 3. Eliminate understory brush where it competes with trees for soil moisture. -2-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Dahms, Walter G; Pacific Northwest Forest and Range Experiment Station (Portland, Or. ). [Portland, Or. : Pacific Northwest Forest and Range Experiment Station, Forest S
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