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Giant Ragweed (Ambrosia trifida) Control in Soybean (Glycine max)

Published online by Cambridge University Press:  12 June 2017

Jerry A. Baysinger  and
Barry D. Sims
Jerry A. Baysinger
Affiliation:
Dep. Agron., Univ. Mo., Columbia, MO 65211
Barry D. Sims
Affiliation:
Dep. Agron., Univ. Mo., Delta Center, Portageville, MO 63873
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Abstract

Two field experiments were established in 1988 and 1989 in southeast Missouri to evaluate several herbicides and herbicide combinations for giant ragweed control in soybean. In 1988, a timely rainfall was not received for soil-applied herbicides and giant ragweed control was less than 75%. However, in 1989 soil moisture was sufficient for uptake of soil-applied herbicides and early season giant ragweed control was generally greater than 80%. Chlorimuron, chlorimuron plus 2,4-DB, imazaquin plus 2,4-DB, acifluorfen followed by naptalam plus 2,4-DB, fomesafen, and imazethapyr applied to 2.5 to 5-cm giant ragweed controlled more than 85% in 1988. In 1989, all POST treatments except imazaquin controlled more than 81% of giant ragweed 2 wk after treatments. Imazethapyr controlled seedling giant ragweed at heights up to 12 to 25 cm. Giant ragweed regrowth and/or reinfestation and giant ragweed seed production occurred with all herbicide treatments.

Keywords

Acifluorfen, 5-[2-chloro-4-(trifluoromethyl)phenoxy]-2-nitrobenzoic acidchlorimuron, 2-[[[[(4-chloro-6-methoxy-2-pyrimidinyl)amino]carbonyl]-amino]sulfonyl]benzoic acid2,4-DB, 4-(2,4-dichlorophenoxy)butanoic acidfomesafen, 5-[2-chloro-4-(trifluoromethyl)phenoxy]-N-(methylsulfonyl)-2-nitrobenzamideimazaquin, 2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imodazol-2-yl]-3-quinolinecarboxylic acidimazethapyr, 2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2yl]-5-ethyl-3-pyridinecarboxylic acidnaptalam, 2-[(1-naphthalenyl-amino)carbonyl]benzoic acidgiant ragweed, Ambrosia trifida L. ♯ AMBTRsoybean, Glycine max (L.) Merr. ‘Asgrow 5474’Acifluorfenbentazonchlorimuronclomazonefomesafenimazaquinimazethapyrlactofenmetribuzinnaptalam2,4-DBAMBTR
Type
Research
Information
Weed Technology , Volume 6 , Issue 1 , March 1992 , pp. 13 - 18
Copyright
Copyright © 1990 by the Weed Science Society of America 

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References

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