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<br />. <br /> <br />. <br /> <br />In <br />~ <br />~ treaty obligations with the Republie of Mexico. The facilities include <br />~ <br />~. Elephant Butte and Caballo Reservoirs, New Mexieo; Percha, Leasburg, and Mesilla <br />~i <br /> <br />Diverslon Dams, New Mexieo; and Riverside Diversion Dam, Texas. <br /> <br />During the past year, three ~aging stations were installed in designated <br /> <br />wasteways in the EPCWID facilities. <br /> <br />Five ~aging stations were installed <br /> <br />on drains and three on the Rio Grande within projeet boundaries. <br /> <br />Phreatophyte Mana~ement Program - Elephant Butte and Caballo Reservoirs <br /> <br />The eooperative program of ve~etation management and water conservation between <br /> <br />the project and the State of New Mexieo was eontinued on the flood plain of <br /> <br />Caballo Reservoir during 1980. Operations were confined to the mowing of <br /> <br />4,391 acres (1,777 hectares) of previously eleared sites with no new elearing of <br /> <br />riparian vegetation. <br /> <br />In an effort to make the vegetation management program more efficient, the <br /> <br />Serviee has been investigating various alternatives to the present annual mowing <br /> <br />program, whieh has been the norm for the. past 8 years. The present mowing <br /> <br />program only reduces the biomass of regrowth and does not have a reduetive <br /> <br />effect on the population of salteedar and other woody phreatophytes. With <br /> <br />higher fuel and payroll eosts, the mowing program grows more expensive eaeh <br /> <br />year. Ideally, a suitable long term, integrated pest management seheme would <br /> <br />reduee the infestation of phreatophytie weeds in previously eleared areas and <br /> <br />reduce the associated eost of maintenanee. <br /> <br />The Serviee has investigated a number of eontrol methods, ineluding inseets, <br /> <br />pathogens, and electrical discharge systems and has determined that seleetive <br />