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Brush Response to Spacing and Individual-Plant Herbicide Treatments

Published online by Cambridge University Press:  12 June 2017

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

Soil-applied herbicides were evaluated for control of blackjack oak (Quercus marilandica Muenchh.), huisache [Acacia farnesiana (L.) Willd.], honey mesquite [Prosopis juliflora (Swartz) DC. var. glandulosa (Torr.) Cockerell], live oak (Quercus virginiana Mill.), Macartney rose (Rosa bracteata Wendl.), winged elm (Ulmus alata Michx.), and yaupon (Ilex vomitoria Ait.) in Texas. Various spacing of spot treatments of pelleted tebuthiuron {N-[5-(1,1-dimethylethyl)-1,3,4-thiadiazol-2-yl]-N,N′-dimethylurea} on huisache and live oak and picloram (4-amino-3,5,6-trichloropicolinic acid) on Macartney rose up to a 2.7-m square grid did not change herbicide effectiveness. Pelleted tebuthiuron at 2.2 kg/ha reduced the canopy of live oak and killed a significant percentage of plants; however, differences among herbicide formulations and distance of placement in a grid were small. On unburned plots, 2.2 kg/ha of tebuthiuron applied as pellets at 2.7-m centers and as a broadcast wettable-powder treatment killed fewer yaupon than pellets applied in most broadcast treatments. In individual-plant treatments, bromacil (5-bromo-3-sec-butyl-6-methyluracil) and picloram solutions at 2 g/plant killed 45% of the yaupon 1.5 to 2 m tall on a fine sandy loam, whereas 0.5 g/plant of either herbicide killed 70% or more of the yaupon plants 1 m tall on a loamy fine sand. Both bromacil and picloram at 1 g/plant killed all blackjack oak and winged elm sprouts 1 to 2 m tall. On a clay soil, 1 g of bromacil/plant killed 79% of the live oak and 88% of the winged elm plants, whereas picloram killed only 38 and 45%, respectively. Neither bromacil nor picloram was effective as soil treatments for killing honey mesquite.

Keywords

Acacia farnesianaIlex vomitoriaProsopis juliflora var.glandulosaRosa bracteataQuercus virginiana
Type
Research Article
Information
Weed Science , Volume 30 , Issue 4 , July 1982 , pp. 378 - 384
Copyright
Copyright © 1982 by the Weed Science Society of America 

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References

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