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Sicklepod (Cassia obtusifolia) Management in Soybeans (Glycine max)

Published online by Cambridge University Press:  12 June 2017

Mary E. Sherman ,
Lafayette Thompson Jr.  and
Robert E. Wilkinson
Mary E. Sherman
Affiliation:
Crop Sci. Dep. North Carolina State Univ., Raleigh, NC 27607
Lafayette Thompson Jr.
Affiliation:
Crop Sci. Dep. North Carolina State Univ., Raleigh, NC 27607
Robert E. Wilkinson
Affiliation:
Agron. Dep., Univ. of Georgia, Experiment, GA 30212
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Abstract

Greenhouse and on-farm tests were conducted in North Carolina in 1979 and 1980 to evaluate sicklepod (Cassia obtusifolia L. # CASOB) management in soybeans [Glycine max (L.) Merr.]. All postemergence herbicide applications gave better sicklepod control when applied following vernolate [S-dipropylthiocarbamate) preplant incorporated than when applied following alachlor [2-chloro-2,6-diethyl-N-(methoxymethyl)acetanilide] preemergence. This resulted from decreased fatty alcohols and hydrocarbons in the epicuticle of vernolate-treated sicklepod. When applied sequentially to vernolate, toxaphene (chlorinated camphene, 67 to 69% chlorine) plus an oil concentrate and acifluorfen {5-[2-chloro-4-(trifluoromethyl)phenoxy]-2-nitrobenzoic acid} applied postemergence to the first true-leaf stage of sicklepod resulted in 95 and 90% control, respectively. Linuron [3-(3,4-dichlorophenyl)-1-methoxy-1-methylurea] and metribuzin [4-amino-6-tert-butyl-3-(methylthio)-as-triazin-5(4H)-one] applied alone or as tank mixes with 2,4-DB [4-(2,4-dichlorophenoxy)butyric acid] provided greater than 90% sicklepod control when applied postemergence-directed to soybeans. Metribuzin was more injurious to soybeans than linuron.

Keywords

Herbicidessoil-appliedpostemergence-directedtoxaphenevernolateCASOB
Type
Research Article
Information
Weed Science , Volume 31 , Issue 5 , September 1983 , pp. 622 - 627
Copyright
Copyright © 1983 Weed Science Society of America 

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References

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