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Tebuthiuron Formulation and Placement Effects on Response of Woody Plants and Soil Residue

Published online by Cambridge University Press:  12 June 2017

Robert E. Meyer  and
Rodney W. Bovey
Robert E. Meyer
Affiliation:
Agric. Res. Serv., U.S. Dep. Agric., Dep. Range Sci., Texas A&M Univ., College Station, TX 77843
Rodney W. Bovey
Affiliation:
Agric. Res. Serv., U.S. Dep. Agric., Dep. Range Sci., Texas A&M Univ., College Station, TX 77843
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Abstract

Tebuthiuron {N-[5-(1,1-dimethylethyl)-1,3,4-thiadiazol-2-yl]-N,N′-dimethylurea} in various formulations and placements was applied to honey mesquite (Prosopis glandulosa Torr. # PRCJG), huisache [Acacia farnesiana (L.) Willd. # ACAFA], live oak (Quercus virginiana Mill. # QUEVI), Macartney rose (Rosa bracteata J. C. Wendl. # ROSBC), and Texas whitebrush [Aloysia gratissima (Gillies & Hook.) Troncoso # ALYLY]. There was little difference in a species response to the various tebuthiuron formulations. Pellets (20%) at 2 g ai/tree base reduced the canopy 85% and killed 50% of the honey mesquite. At 1 g ai/plant, two briquettes at 0.5 g ai each or pellets (5.14 g, 20%) killed 37 and 80% of the huisache, respectively. Pellets were no more effective at 2 g than at 1 g ai on huisache. Basal treatments of 0.25, 0.5, 0.5, 1, and 2 g ai tebuthiuron/tree killed from 8 to 22, 48 to 62, 62 to 85, and 92% of the live oak, respectively. Pellets at 2 g ai placed at the base reduced the canopy 83% and killed 59% of the Macartney rose. On Texas whitebrush, 0.25, 0.5, 1, and 2 g ai tebuthiuron/tree killed from 68 to 85, 75 to 100, 90, and 100% of the plants, respectively. Tebuthiuron persisted mainly in the upper 30 cm of soil for at least 15 months.

Keywords

Herbicide pelletsherbicide sprayssoil residueAcacia farnesianaAloysia gratissimaProsopis glandulosaQuercus virginianaRosa bracteataACAFAALYLYPRCJGQUEVIROSBC
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 36 , Issue 3 , May 1988 , pp. 373 - 378
Copyright
Copyright © 1988 by the Weed Science Society of America 

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