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Weed Control in Soybean (Glycine max) with Lactofen Plus Chlorimuron

Published online by Cambridge University Press:  12 June 2017

P. Roy Vidrine ,
Daniel B. Reynolds  and
James L. Griffin
P. Roy Vidrine
Affiliation:
Dean Lee Res. Stn., 8105 E. Campus, Alexandria, LA 71302
Daniel B. Reynolds
Affiliation:
Northeast Res. Stn., Box 438, St. Joseph, LA 71366
James L. Griffin
Affiliation:
Dep. Plant Pathol. Crop Physiol., 302 Life Sci. Bldg., Baton Rouge, LA 70803
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Abstract

Field experiments were conducted over a 3-yr period at three locations to evaluate lactofen at rates of 110 to 220 g ai ha−1 applied POST in combination with chlorimuron at 9 g ae ha−1 for weed control in soybean. At St. Joseph in 1989 and Baton Rouge in 1990, lactofen at 110, 150, and 170 g ha−1 in combination with chlorimuron controlled prickly sida (3 to 5 cm) and entireleaf and pitted morningglory (5 to 13 cm) comparable with the full rate of lactofen at 220 g ha−1 plus chlorimuron and the standard treatment of acifluorfen at 280 g ae ha−1 plus bentazon at 560 g ae ha−1. Entireleaf morningglory and sicklepod control at Alexandria with lactofen at 110 to 170 g ha−1 plus chlorimuron was comparable with that from the full rate of lactofen plus chlorimuron and better than with acifluorfen plus bentazon. Weed control was reduced when soil moisture was deficient at treatment time or when prickly sida height was more than 5 cm and entireleaf morningglory, pitted morningglory, and sicklepod more than 15 cm. In related studies at St. Joseph, a reduced rate of lactofen (170 g ha−1) in combination with chlorimuron controlled prickly sida 98%, pitted morningglory 93%, and entireleaf morningglory 90% in 1988, which was comparable with the control from the full rate of lactofen plus chlorimuron and with acifluorfen plus bentazon.

Keywords

Acifluorfen, 5-[2-chloro-4-(trifluoromethyl)phenoxy]-2-nitrobenzoic acidbentazon, 3-(1-methylethyl)-(1H)-2,1,3-benzothiadiazin-4(3H)-one 2,2-dioxidechlorimuron, 2-[[[[(4-chloro-6-methoxy-2-pyrimidinyl)amino]carbonyl]amino]sulfonyl]benzoic acidlactofen, (±)-2-ethoxy-1-methyl-2-oxyethyl 5-[2-chloro-4-trifluoromethyl)phenoxy]-2-nitrobenzoateentireleaf morningglory, Ipomoea hederacea var. integriuscula Gray # IPOHGpitted morningglory, Ipomoea lacunosa L. # IPOLAprickly sida, Sida spinosa L. # SIDSPsicklepod, Cassia obtusifolia L. # CASOBsoybean, Glycine max (L.) Merr. ‘Asgrow 6785’, ‘Coker 686’, ‘Davis', ‘Hartz 5164’, and ‘Ring Around 606’Herbicide mixturesreduced ratesacifluorfenbentazonCassia obtusifoliaIpomoea hederaceaIpomoea lacunosaSida spinosaCASOBIPOHGIPOLASIDSP
Type
Research
Information
Weed Technology , Volume 7 , Issue 2 , June 1993 , pp. 311 - 316
Copyright
Copyright © 1993 Weed Science Society of America 

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References

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