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<br />OOl7?u <br /> <br />A rapidly spreading potential phreatophyte problem species, Russian <br />olive (Eleagnus angustifolia L.), has not been subjected to control <br />measures to any great extent. Dormant, basal spray applications of <br />silvex at 6 lb aehg in diesel oil effectively controlled trees varying <br />in size from 1 inch to 6 inches (unpublished results, Agricultural <br />Research Service, USDA, Los Lunas, New Mexico). A rancher in Kansas <br />(personal communication, 1966) sprayed Russian olive with a l:l mixture <br />of 2,4-D and 2,4,5-T at a total of 2 lb/A in 1964, and again in 1965 <br />with a 2:1 mixture of 2,4-D and 2,4,5-T at 3 lb/A. Even with these <br />relatively heavy rates, very poor results were evident. It appears <br />that control studies will have to be initiated on this potential <br />problem species. <br /> <br />Summary <br /> <br />Research on chemical control of woody plants growing as phreatophytes <br />has shown that they are difficult to kill. In almost all cases, <br />repeated sprays are necessary to control these plants. Problems <br />arising in the chemical control of phreatophytes stem from where they <br />grow--river channels, as well as in and on irrigation ditches. Plants <br />not previoualy considered serious phreatophyte problems, such as <br />Russian olive, must be given attention in chemical control studies. <br /> <br />23 <br />