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Effects of Season and Rate of Application of 2,4-D and 2,4,5-T on Pine Seedlings and Mountain Whitethorn in California

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Intermingled pines and mountain whitethorn were treated with foliar sprays of 2,4-D and 2,4,5-T to test their effects according to (1) season of year, (2) concentration of spray on individual tree-brush clumps, and (3) spray dosage applied on an area basis. Spraying with 2,4,5-T in September resulted in the best tree growth and most brush kill; 2,4-D caused the most tree damage and was less effective as a brush killer. The best brush kill resulted from application rates of 400 to 600 ppm of 2,4,5-T, but these concentrations reduced tree growth. After two full growing seasons, average height growth of the pines was greater on plots receiving from ΒΌ to 1 pound of 2,4,5-T per acre than on the control plots. Application rates of 2 and 4 pounds per acre (ppa) gave best brush kill but caused severe damage to the pines.
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Document Type: Journal Article

Affiliations: Research Forester, Rocky Mountain Forest and Range Expt Sta., Flagstaff, Ariz.

Publication date: 1964-07-01

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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.

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