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Sensitivity of Douglas-fir (Pseudotsuga menziesii [Mirb.] Franco) and ponderosa pine (Pinus ponderosa Laws.) seedlings to operational-type brush control treatments was tested with simulated aerial sprays on potted 2-0 seedlings. Treatments of one to four pounds per acre of several herbicides applied at two-week intervals indicated that Douglas-fir might be expected to recover from applications used to kill brush in a four-month period during spring and summer. Ponderosa pine was more severely damaged than Douglas-fir, but demonstrated its greatest resistance in late summer, and its greatest sensitivity in spring and early summer. Douglas-fir, while it suffered the greatest apparent damage during the period of most rapid growth, recovered most readily from the early-season treatments. The effects of late-season treatments were especially noticeable with Amitrol; all trees treated with 2,4,5-T made complete recovery by the end of the second growing season; 2,4,5-T amine and 4-(2,4,5-TB) ester caused no measurable damage at any time, indicating that selectivity for Douglas-fir may be brought about by manipulation of solvent and formulation as well as molecular configuration.
Document Type: Journal Article
Instructor, School of Forestry, Oregon State University, Corvallis
Publication date: September 1, 1963
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The Journal of Forestry is the most widely circulated scholarly forestry journal in the world. In print since 1902, the Journal has received several national awards for excellence. The mission of the Journal of Forestry is to advance the profession of forestry by keeping forest management professionals informed about significant developments and ideas in the many facets of forestry: economics, education and communication, entomology and pathology, fire, forest ecology, geospatial technologies, history, international forestry, measurements, policy, recreation, silviculture, social sciences, soils and hydrology, urban and community forestry, utilization and engineering, and wildlife management. The Journal is published bimonthly: January, March, May, July, September, and November.