COOPERATORS: 3 D RANCH, DONNA SCHUSTER   ROBERT ELLEDGE, KINNEY COUNTY BOB LYONS, EXTENSION RANGE SPECIALIST   SUMMARY Huisache trees were treated using the leaf-spray individual plant treatment method for control in 1996 in Gonzales and Maverick counties and in 1999 in Guadalupe and Kinney counties.  Three different herbicide mixtures were used in Gonzales, Guadalupe, and Kinney counties and four in Maverick County.  In all demonstrations, all herbicide mixes provided very high control levels (greater than 75%). Because of chemical costs and plant size, treatments including combinations of Remedy, Reclaim, or Tordon 22K resulted in per plant treatment costs up to more than $0.20.  In contrast, Grazon P+D treatments costs averaged about $0.08 per plant making this the treatment of choice.     PROBLEM Huisache spreads aggressively on some rangelands competing for water and nutrients.     OBJECTIVES Individual plant treatments offer ranchers a viable tool for brush maintenance.  These demonstrations were established to determine the effectiveness of the leaf-spray individual plant treatment method for huisache management.       MATERIALS AND METHODS In the fall of 1996 and 1998 leaf-spray treatment plots were established in counties within the Extension Districts of 10 and 12.   In Kinney County plots  were established over areas which had been treated with a Lawson Aerator 3 years earlier for plant top removal.  Huisache plants  ranged in height from under 12 to over 70 inches.  Treatments were applied by 2- to 3-person crews using an ATV equipped with spray tanks and 3 sprayguns equipped with 5500-X8 Adjustable Conjet Nozzles.  Four potential herbicide mixtures were used which included 1) 0.5% Reclaim + 0.5% Remedy, 2) 0.5% Reclaim + 0.5% Tordon 22K, 3) 0.5% Remedy + 0.5% Tordon 22K 0.25%, or 4) 1% Grazon P+D.  All herbicide were mixed in water with 0.25% surfactant, 0.25% HiLite Blue Dye.   RESULTS AND DISCUSSION Apparent plant-kill 1 year following treatment averaged 96% with a range of 86 to 100% (Figure 1).   Spray costs (Figure 1) ranged from about 0.02 to 0.19 cents per plant, while labor costs ranged from 0.04 to 0.07 cents per plant.  Total costs ranged from 0.03 to 0.26 cents per plant.     CONCLUSIONS All leaf-spray mixtures used in these demonstrations provided very high huisache control.  Previous work indicates that fall is the optimum time for this method.  Treatment costs for similar height mesquite plants have averaged $0.12 per plant with the Reclaim/Remedy treatment.  Therefore, it appears that plant size is even more important in controlling treatment costs when dealing with huisache.  Because of costs and control levels in these demonstrations, Grazon P+D is the method of choice.  ACKNOWLEDGMENTS We wish to thank DowElanco for their support in these demonstrations efforts.