Document Type

Thesis - Open Access

Award Date


Degree Name

Master of Science (MS)

Department / School



Woody plants have become established upon millions of acres of range land in the United States during the past 50 years. Because of the undesirability of many species, various methods for their control have been investigated extensively during the past few years. Many species can be controlled by foliage sprays with modern hericides, while others do not respond to this method of application but may be eliminated by basal trunk treatments with herbicides. Basal trunk treatment consists of spraying the base of trunk of individual trees to a height of approximately eighteen inches from the soil level. The basal treatment of individual trees generally requires petroleum oils as carriers of 2,4-D (2,4-dichlorophenoxyacetic acid) or 2, 4,5-T, (2,4,5-trichlorophenoxyacetic acid). The oils used as carriers of the herbicides must penetrate heavily subsidized-corky-bark in order to reach the live woody tissues. A differential rate of penetration of various petroleum oils has been observed by a number of investigators. It is the purpose of this paper to report a laboratory method developed to determine the relative rate of movement of various petroleum fractions and to establish the physical or chemical properties of oils that may be used in estimating such differences. Differences in rate of penetration of petroleum oils as carriers for herbicides in woody tissues are obviously one of the important considerations in selecting oils for its use. The work was conducted during the past two seasons.

Library of Congress Subject Headings



Includes bibliographical references



Number of Pages



South Dakota State University


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