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Herbaceous Weed Control with Hexazinone in Loblolly Pine (Pinus taeda) Plantations

Published online by Cambridge University Press:  12 June 2017

C. H. Fitzgerald  and
J. C. Fortson
C. H. Fitzgerald
Affiliation:
School of For. Resources, Univ. of Georgia, Athens, GA 30602
J. C. Fortson
Affiliation:
School of For. Resources, Univ. of Georgia, Athens, GA 30602
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Abstract

Hexazinone [3-cyclohexyl-6-(dimethylamino)-1-methyl-1,3,5-triazine-2,4 (1H, 3H)-dione] effectively controlled herbaceous weeds in a loblolly pine (Pinus taeda L.) plantation in 1975. Pine seedling height increased as a result of weed control following 1 to 3 kg/ha applications but phytotoxic symptoms were evident. A 1976 field study indicated activated charcoal root coatings may reduce phytotoxic action. Hexazinone at 3 and 4 kg/ha applied to either the foliage or the soil was toxic to potted pine seedlings in 1976. The addition of surfactant to hexazinone treatments at 2, 3, and 4 kg/ha increased pine phytotoxicity to unacceptable levels. When hexazinone was applied to soil at 2, 3, and 4 kg/ha, activated charcoal root coatings reduced pine mortality to acceptable levels on Norfolk sandy loam. Charcoal was less effective on Madison clay loam. Pine tolerance on both soils was acceptable at 2 kg/ha.

Keywords

Surfactantactivated charcoalroot coatings
Type
Research Article
Information
Weed Science , Volume 27 , Issue 6 , November 1979 , pp. 583 - 588
Copyright
Copyright © 1979 by the Weed Science Society of America 

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References

Literature Cited

1. Fitzgerald, C. H., Peevy, F. A., and Fender, D. E. 1973. Rehabilitation of forest land — the southern region. J. For. 71:3:148–153.Google Scholar
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3. Voeller, J. E. and Holt, H. A. 1975. Screening herbicides for pine toxicity. Proc. South. Weed Sci. Soc. 28:244.Google Scholar