Abstract
During the last decade it has become increasingly apparent to engineers and agronomists of large irrigation and flood control projects in the arid Southwest that a group of plants known as phreatophytes has become a major problem in water conservation (Fletcher and Elmendorf 1955). These plants grow near the shorelines of reservoirs, along streams and irrigation canals, or wherever the water table is relatively high, and extend their roots into the capillary fringe (Marks 1950). They frequently form dense communities and use water at a very rapid rate which may amount to 20 to 25 million acre-feet annually (Robinson 1952). Phreatophytes are also harmful in that they can establish themselves on newly formed sandbars, which then become stabilized and interfere with the movement of water downstream. New infestations and ad-
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