Potential Herbicides for Brush Control

Several new herbicides and herbicide combinations were evaluated in the greenhouse for control of honey mesquite, huisache, whitebrush, live oak and Texas persimmon. 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 to 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.