. Chemical control of brush in ponderosa pine forests of central Oregon. Brush Control Oregon; Ponderosa pine Oregon. INTRODUCTION The many acres of forest land that are occupied by brush in central Oregon represent a large-scale waste of timber-growing capacity and a major economic loss to the area. Although large brushfields devoid of tree growth present the most spectacular examples of loss, less obvious but equally important brush prob- lems are common in established timber stands. Brush frequently overtops and suppresses young seedlings for long periods of time in small natural forest ope
. Chemical control of brush in ponderosa pine forests of central Oregon. Brush Control Oregon; Ponderosa pine Oregon. INTRODUCTION The many acres of forest land that are occupied by brush in central Oregon represent a large-scale waste of timber-growing capacity and a major economic loss to the area. Although large brushfields devoid of tree growth present the most spectacular examples of loss, less obvious but equally important brush prob- lems are common in established timber stands. Brush frequently overtops and suppresses young seedlings for long periods of time in small natural forest open- ings and competes with trees of all sizes for soil moisture. The three most common brush species in central Oregon are pine manza- nita (Arctostaphylos parryana var. pinetorum), snowbrush ceanothus (Ceanothus velutinus), and golden chinkapin (Castanopsis chrysophylla). Manzanita, the most light demanding of the three, is usually the major species in large brushfields. It also occurs frequently in small openings of irregularly stocked forests or as an understory be- neath sparsely stocked ponder- osa pine (Pinus ponderosa) stands (fig. 1). Manzanita offers especially severe com- petition^' to young pine seed- lings (fig. 2) and may delay regeneration of small openings or sparsely stocked stands for many Figure 1. — Understocked old-growth ponderosa pine with manzanita understory. _' Dahms, Walter G. The effect of manzanita and snowbrush competition on ponderosa pine reproduction. Forest Serv. Pac. NW. Forest & Range Expt. Sta. Res. Note 65, 3 pp. 1950. (Processed.). 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 Service,
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