. Chemical control of brush in ponderosa pine forests of central Oregon. Brush Control Oregon; Ponderosa pine Oregon. Figure 3. — A dense understory of ponderosa pine saplings typical of trees used to determine tolerance of ponderosa pine to herbicides. and at those locations where brush was encountered it was rated as dead or live. Before percentage of brush cover dead was adopted as the criterion to be used, percentage of plants dead on each plot was tried on manzanita plots. Results were nearly the same regardless of the criterion used. The standard used to rate tolerance of ponderosa pine
. Chemical control of brush in ponderosa pine forests of central Oregon. Brush Control Oregon; Ponderosa pine Oregon. Figure 3. — A dense understory of ponderosa pine saplings typical of trees used to determine tolerance of ponderosa pine to herbicides. and at those locations where brush was encountered it was rated as dead or live. Before percentage of brush cover dead was adopted as the criterion to be used, percentage of plants dead on each plot was tried on manzanita plots. Results were nearly the same regardless of the criterion used. The standard used to rate tolerance of ponderosa pine to herbicide treat- ments was percentage of terminal buds or leaders dead. Growth rate of ponderosa pine before and after treatment and number of years of growth killed were measured on 19 trees growing on two aerial spray plots that had received approximately 1 pound per acre of 2, 4-D in an emulsion carrier. These plots were treated in 1954. Examinations were generally made in the summer of the year following treatment. Where treatments had been applied in late summer or early fall, examinations were delayed until the second summer after treatment. However, amount of sprout growth that would eventually develop could not always be gaged at the end of the 1 - to 2-year period after treatment. The various treatments applied to manzanita, chinkapin, snowbrush, and ponderosa pine are shown in tables 1 to 4. -5-. 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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