Potential Herbicides for Brush Control

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Abstract
Several new herbicides and herbicide combinations were evaluated in the greenhouse for control of honey mesquite [Prosopis juliflora var. glandulosa], huisache [Acacia farnesiana], whitebrush [Aloysia lycioides], live oak [Quercus virginiana] and Texas persimmon [Diospyros texana]. Sprays of picloram, triclopyr ester and 3,6-dichloropicolinic acid at 0.56 kg/ha were the most effective herbicides in reducing the canopy of honey mesquite. Picloram at 0.14-0.56 kg/ha effectively defoliated huisache. At 1.12 kg/ha tebuthiuron, buthidazole, hexazinone and 3,6-dichloropicolinic acid also defoliated huisache. Whitebrush was effectively controlled with picloram, triclopyr ester, tebuthiuron, buthidazole, hexazinone, dicamba and ethidimuron at 0.56 kg/ha. None of the treatments was effective against live oak or Texas persimmon. Certain combinations of picloram plus triclopyr effectively defoliated whitebrush and honey mesquite. Picloram plus 3,6-dichloropicolinic acid was also effective for honey mesquite control.