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Control of an Oak (Quercus) Complex with Herbicide Granules

Published online by Cambridge University Press:  12 June 2017

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

Granule, and in some cases, tablet and ball formulations of bromacil (5-bromo-3-sec-butyl-6-methyluracil), dicamba (3,6-dichloro-o-anisic acid), picloram (4-amino-3,5,6-trichloropicolinic acid), karbutilate [tert-butylcarbamic acid ester with 3(m-hydroxyphenyl)-1,1-dimethylurea], and tebuthiuron {N-[5-(1,1-dimethylethyl)-1,3,4-thiadiazol-2-yl]-N,N′-dimethyl urea} were applied to three areas within 30 km of College Station in the Claypan Resource area of Texas. Woody species growing in the area included blackjack oak (Quercus marilandica Muenchh.), post oak (Quercus stellata Wangenh.), yaupon (Ilex vomitoria Ait.), winged elm (Ulmus alata Michx.), white ash (Fraxinus americana L.), mockernut hickory (Carya tomentosa Nutt.), and tree huckleberry (Vaccinium arboreum Marsh.). Granules were applied either broadcast or in rows at several intervals. Tebuthiuron was the most effective herbicide on oaks, winged elm, and white ash. Tebuthiuron and picloram were equally and most effective on yaupon, mockernut hickory, and tree huckleberry. Tebuthiuron + picloram at 2.2 + 2.2 kg/ha was the most effective herbicide treatment on huckleberry. However, a mixture of tebuthiuron + picloram (1:1 w/w) was usually no more effective than the same rate of tebuthiuron in the mixture applied alone. Tablet and ball formulations of karbutilate and tablet formulations of tebuthiuron were generally equally as effective as granules. Applications of picloram and tebuthiuron granules in rows 1.8, 3.0, 4.6, or 6.1 m apart gave control equal to broadcast applications except for picloram on yaupon. On yaupon all row spacing treatments of picloram were less effective than the broadcast treatment, whereas with tebuthiuron the 6.1-m spacing was least effective. Picloram and tebuthiuron granules applied in rows, approximately at 1.8-m intervals with a tractor, were as effective as granules applied by hand in straight rows.

Keywords

Bromacildicambakarbutilatepicloram tebuthiuron
Type
Research Article
Information
Weed Science , Volume 26 , Issue 5 , September 1978 , pp. 444 - 453
Copyright
Copyright © 1978 by the Weed Science Society of America 

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References

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