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Clomazone for Control of Grasses in Flue-Cured Tobacco (Nicotiana tabacum) Seedbeds

Published online by Cambridge University Press:  20 January 2017

Kenneth C. Flower
Kenneth C. Flower*
Affiliation:
Tobacco Research Board, Kutsaga Research Station, P.O. Box 1909, Harare, Zimbabwe
*
Corresponding author's E-mail: [email protected].
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Abstract

Experiments were conducted in 1995, 1996, and 1999 to evaluate clomazone preemergence in flue-cured tobacco seedbeds. The seedbeds were fumigated with methyl bromide to kill all the weeds and other pests, and then the subplots designated as grassy were sown with a mixture of equal mass of crowfootgrass, goosegrass, and rhodesgrass. Clomazone rates were 0, 0.14, 0.28, 0.42, and 0.56 kg ai/ha for 1995 and 0, 0.42, 0.47, 0.52, and 0.94 kg ai/ha for 1996 and 1999. The rates of clomazone in 1996 and 1999 were based on the 1995 results where 0.42 kg/ha decreased the dry mass of grasses by 98% compared with the nontreated control, while clomazone at 0.28 kg/ha decreased the dry mass of grasses by 75%, and this was not considered adequate. In 1995, 0.56 kg clomazone/ha decreased the tobacco seedling number but had no effect on the growth of tobacco plants. In 1996 and 1999 clomazone had no effect on the number or dry mass of tobacco seedlings despite causing slight discoloration 4 wk after sowing at all rates in 1996. This discoloration had disappeared by transplanting time. The effect of grass competition on the emergence and growth of tobacco was severe in the nontreated subplots. More grasses emerged in 1999 than in 1996, possibly due to higher temperatures; however, few grasses survived until transplanting time in clomazone-treated areas. All the clomazone rates tested in 1996 and 1999 were satisfactory as there was no crop injury or detrimental effect of the grasses on tobacco in the clomazone-treated grassy subplots. Therefore, the 0.42-kg clomazone/ha rate is considered optimal.

Keywords

Clomazonecrowfootgrass, Dactyloctenium aegyptium (L.) Beauv. # DDTAEgoosegrass, Eleusine indica (L.) Gaertn. # ELEINrhodesgrass, Chloris gayana Kunth # CHRGAtobacco, Nicotiana tabacum L. ‘Kutsaga Mammoth 10’Fluazifop-p-butyl, haloxyfop-R-methyl, methyl bromide, preemergence herbicideANOVA, analysis of variancePRE, preemergence
Type
Research
Information
Weed Technology , Volume 15 , Issue 4 , December 2001 , pp. 617 - 622
Copyright
Copyright © Weed Science Society of America 

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References

Literature Cited

Anonymous. 1997. Rep. of the Ninth Meeting of the Parties to the Montreal Protocol on Substances that Deplete the Ozone Layer. UNEP/OzL/Pro.9/12, September 25, 1997 (Annex III).Google Scholar
Mead, R. and Curnow, R. N. 1990. Analysis of a split plot experiment. In Statistical Methods in Agriculture and Experimental Biology. London: Chapman and Hall. pp. 98–103.Google Scholar
Rayner, A. A. 1967. An introduction to field experiments. In A First Course in Biometry for Agriculture Students. Pietermaritzburg, RSA: University of Natal. pp. 220–241.Google Scholar
Scott, J. E., Weston, L. A., Chappell, J., and Hanley, K. 1994. Effects of clomazone on IPP isomerase and prenyl transferase activities in cell suspension cultures and cotyledons of solanaceous species. Weed Sci. 42: 509–516.Google Scholar
Tobacco Research Board. 1987. Herbicides for the Control of Annual Grasses and Broadleaf Weeds, Kutsaga. Annual Rep., Flue-Cured Tobacco. Volume 1. pp. 30–83.Google Scholar
Tobacco Research Board. 1988. Herbicides for the Control of Annual Grasses and Broadleaf Weeds in Tobacco. Annual Rep., Flue-Cured Tobacco. Volume 1. pp. 62–97.Google Scholar
Tobacco Research Board. 1996a. Section D2—Grasses, Tops and Suckers. Harare, Zimbabwe: Flue-Cured Recommendations.Google Scholar
Tobacco Research Board. 1996b. Use of Fluazifop-p-butyl in Seedbeds. Harare, Zimbabwe: Kutsaga Research Station, Unpublished Experimental Rep. 96AG02S.Google Scholar
Tobacco Research Board. 1998. Section A—Production of Seedlings. Harare, Zimbabwe: Flue-Cured Recommendations.Google Scholar