. Chemical control of brush in ponderosa pine forests of central Oregon. Brush Control Oregon; Ponderosa pine Oregon. Results Pine Manzanita Foliage sprays of 2, 4-D and 2, 4, 5-T were found to be highly and equally effective on manzanita when applied during the period from early May to early July (fig. 4). Rates of application for both chemicals as low as 0. 5 pound per acre in an emulsion carrier or 0. 75 pound in a water carrier resulted in an aver- age kill close to 80 percent. Thus, approximately two-thirds as much chemical is required with an emulsion carrier as with a water carrier to a
. Chemical control of brush in ponderosa pine forests of central Oregon. Brush Control Oregon; Ponderosa pine Oregon. Results Pine Manzanita Foliage sprays of 2, 4-D and 2, 4, 5-T were found to be highly and equally effective on manzanita when applied during the period from early May to early July (fig. 4). Rates of application for both chemicals as low as 0. 5 pound per acre in an emulsion carrier or 0. 75 pound in a water carrier resulted in an aver- age kill close to 80 percent. Thus, approximately two-thirds as much chemical is required with an emulsion carrier as with a water carrier to achieve a speci- fied degree of control. COVER DEAD 100 Percent Figure 4 — Average percentage of manzanita cover killed by 2, 4-D and 4, 5-T applied during the growing season (combined results for May 6, May 27, and July 5, 1955— basis, 72 plots). The emul- sion carrier contained 1 gal- lon of summer oil per .50 ,75 .50 .75 RATE ( Pounds per acre ) LEGEND: Water carrier Emulsion carrier Susceptibility of manzanita to both 2, 4-D and 2, 4, 5-T rose gradually from early May and reached a high point in early July. By late September, effective- ness of both chemicals had fallen off greatly (fig. 5). Results from a 1953 experi- mentZ/ at Pringle Falls Experimental Forest indicate that effectiveness of both — Dahms, Walter G. Chemical brush control on central Oregon ponder- osa pine lands. Forest Serv. Pac. NW. Forest & Range Expt. Sta. Res. Note 109, 5pp. 1955. (Processed.) -10-. 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, U. S. Dept. of Agriculture]
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