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Effect of Herbicides on Ivyleaf Morningglory (Ipomoea hederacea) Interference in Soybean (Glycine max)

Published online by Cambridge University Press:  12 June 2017

James C. Holloway Jr.  and
David R. Shaw
James C. Holloway Jr.
Affiliation:
Dep. Plant and Soil Sci., Mississippi State Univ., Mississippi State, MS 39762
David R. Shaw
Affiliation:
Dep. Plant and Soil Sci., Mississippi State Univ., Mississippi State, MS 39762
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Abstract

Ivyleaf morningglory weed-free period, weedy period, and density studies were conducted in 1993 and 1994 to determine the effects of soil-applied imazaquin and chlorimuron plus metribuzin on ivyleaf morningglory interference in soybean. A weed-free period of 4 wk was needed to maintain soybean yield equivalent to weed-free season long when herbicides were not used, but treatment with either chlorimuron plus metribuzin or imazaquin maintained yield comparable to weed-free at all intervals. Ivyleaf morningglory biomass was reduced by both herbicides across all weed-free periods. The period nontreated ivyleaf morningglory plants were tolerated without yield loss was only 2 wk, but this interval was extended to 8 wk after treatment with chlorimuron plus metribuzin or imazaquin. Without herbicides, soybean yield was reduced by four ivyleaf morningglory per m of row, but the highest population evaluated in this study (eight per m of row) did not reduce soybean yield after treatment with chlorimuron plus metribuzin or imazaquin. Ivyleaf morningglory biomass was reduced at all densities after treatment with either herbicide.

Keywords

Chlorimuron, 2-[[[[(4-chloro-6-methoxy-2-pyrimidinyl)-amino]carbonyl]amino]sulfonyl]benzoic acidimazaquin, 2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-3-quinolinecarboxylic acidmetribuzin, 4-amino-6-(1,1-dimethylethyl)-3-(methylthio)-1,2,4-triazin-5(4H)-oneivyleaf morningglory, Ipomoea hederacea (L.) Jacq. ♯ IPOHEsoybean, Glycine max (L.) Merr. ‘Terra-Vig 5452.’Weed-free periodweedy perioddensitycompetitioninterferencechlorimuronimazaquinmetribuzinIPOHE
Type
Weed Biology and Ecology
Information
Weed Science , Volume 44 , Issue 4 , December 1996 , pp. 860 - 864
Copyright
Copyright © 1996 by the Weed Science Society of America 

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