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Response of Honey Mesquite (Prosopis glandulosa) and Understory Vegetation to Herbicides

Published online by Cambridge University Press:  12 June 2017

Robert E. Meyer
Affiliation:
U.S. Dep. Agric., Agric. Res. Serv., Dep. Range Sci., Texas A&M Univ., College Station, TX 77843. Headquartered at Grassland, Soil and Water Research Laboratory, Temple, TX 76503
Rodney W. Bovey
Affiliation:
U.S. Dep. Agric., Agric. Res. Serv., Dep. Range Sci., Texas A&M Univ., College Station, TX 77843. Headquartered at Grassland, Soil and Water Research Laboratory, Temple, TX 76503

Abstract

Honey mesquite [Prosopis glandulosa (Torr.) ♯ PRCJG] was treated with several herbicides and herbicide combinations primarily on the Texas Post Oak Savannah over a 4-yr period. Sprays of glyphosate [N-(phosphonomethyl)glycine], picloram (4-amino-3,5,6-trichloropicolinic acid), 2,4,5-T [(2,4,5-trichlorophenoxy)acetic acid], and triclopyr {[(3,5,6-trichloro-2-pyridinyl)oxy] acetic acid} generally caused a high degree of canopy reduction in the fall of the year the spraying was done. However, sprays of clopyralid (3,6-dichloro-2-pyridinecarboxylic acid) and picloram were the most effective herbicides for killing honey mesquite 1 yr after application. At 1.1 kg ai/ha, clopyralid killed 70 to 95% and picloram killed 20 to 65% of plants 3 yr or older. Picloram plus 2,4,5-T was intermediate in effectiveness. Sprays of 2,4,5-T and triclopyr killed some plants. Picloram and tebuthiuron {N-[5-(1,1-dimethylethyl)-1,3,4-thiadiazol-2-yl]-N,N′-dimethylurea} pellets killed few if any honey mesquite. Hexazinone [3-cyclohexyl-6-(dimethylamino)-1-methyl-1,3,5-triazine-2,4(1H,3H)-dione] boluses killed no more than 37% of the honey mesquite at rates up to 4.5 kg ai/ha. Herbicides sometimes killed more honey mesquite with sprouts 2 or 3 yr old than at 1 yr old.

Type
Weed Control and Herbicide Technology
Copyright
Copyright © 1985 by the Weed Science Society of America 

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References

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