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<br />7?.. <br />O!:}1 ...0 <br /> <br />(Surfactant WK) produced measurable results after 16 months (8). Even <br />so, this treatment did not appear promising. <br /> <br />Foliage-Applied Herbicides <br /> <br />As early as 1948 (11), control studies using foliage-applied herbicides <br />were conducted on saltcedar. Research in Arizona, from 1956 to 1962, <br />showed that silvex at 4 lb/A applied in May was more effective than 2.5 <br />lb/A and both rates were much less effective when applied in October (1). <br />Young saltcedar seedlings or regrowth from crowns or buried branches <br />(1 year old, or less) were much more easily killed than was growth 2 <br />years or more old. <br /> <br />Foliage spray treatments of 2 and 4 lb/A of silvex ester in Wyoming <br />(15) applied to small saltcedar plants in August and again the following <br />July, reduced the stand 94 to 100 percent at the heavier rate. Silvex <br />ester treatments to saltcedar at 4 lb/A and made at different times <br />throughout the year in Nevada (3) showed there was little difference <br />due to time of application. Good results were obtained at all spray <br />dates. <br /> <br />Four years of research in New Mexico (8, 9) has shown that one applica- <br />tion of a mixture of 2 lb/A of silvex ester and 2 lb/A of picloram to <br />saltcedar gave promising results. Mowing in the winter and spraying <br />the resulting regrowth in June gave better results than spraying <br />unmowed plants. Spraying unmowed saltcedar in May with 2 lb/A of silvex <br />ester and re-treating again with 2 Ib/A in August the same year, re- <br />duced the stand approximately 50 percent compared to 16 percent control <br />with one application of 4 lb/A of silvex in May. <br /> <br />Dormant-Applied Spray Treatments <br /> <br />Preliminary results of saltcedar control experiments conducted in New <br />Mexico (unpublished data, Agricultural Research Service, USDA, Los <br />Lunas, New Mexico) indicates that, although the herbicide rates are <br />rather high, dormant-applied treatments are effective. Mowing salt- <br />cedar in February and spraying the freshly mowed stumps with 8 lb/A <br />of silvex ester in 50 gpa of diesel oil reduced the stand 72 percent <br />compared to 42 percent for sprayed but unmowed plants. <br /> <br />Spraying saltcedar on a ditchbank with 8 lb aehg of silvex in diesel oil <br />at 100 psi pressure killed 95 percent of the plants treated (6). Spray- <br />ing was done from one side with a high-volume sprayer and a hand gun. <br /> <br />Because dormant treatments appear effective, research in that area was <br />expanded this last year in New Mexico. <br /> <br />21 <br />