Abstract
Catclaw acacia (Acacia greggii Gray) and mimosa (Mimosa biuncifera Bent.) are noxious plants on livestockgrazing lands. A low-energy grubber was tested for performance and effectiveness for controlling catclaw. In plantdensities ranging from 91 to 733 plants/ha (37 to 297 plants/ac), the grubbing rate decreased from 2.8 to 0.5 ha/h (6.8 to1.3 ac/h), respectively. Average rate of grubbing was 1.2 ha/h (3.0 ac/h), which equates to $37.50/ha ($15.00/ac). Therelationship between plant densities (X) and grubbing rates (Y) was best described by the equation Y = exp(4.8 0.8 ln X)(r2 = 0.99). Average plant mortality was 82%. Severing the taproot below the first lateral and removing all buried stemswith adventitious roots was necessary to prevent regrowth. Grubbing catclaw was effective, but the process will be timeconsuming to achieve >90% plant mortality. Grubbing plants in sand dunes >3 m (10 ft) wide or plant densities>400 plants/ha (150 plants/ac) does not appear feasible.
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