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Morningglory (Ipomoea spp.) and Large Crabgrass (Digitaria sanguinalis) Control with Glyphosate and 2,4-DB Mixtures in Glyphosate-Resistant Soybean (Glycine max)

Published online by Cambridge University Press:  20 January 2017

A. Stanley Culpepper ,
Agustin E. Gimenez ,
Alan C. York ,
Roger B. Batts  and
John W. Wilcut
A. Stanley Culpepper
Affiliation:
Crop and Soil Science Department, University of Georgia, P.O. Box 1209, Tifton, GA 31793
Agustin E. Gimenez
Affiliation:
Department of Crop Science, North Carolina State University, Box 7620, Raleigh, NC 27695-7620
Alan C. York*
Affiliation:
Crop and Soil Science Department, University of Georgia, P.O. Box 1209, Tifton, GA 31793
Roger B. Batts
Affiliation:
Department of Crop Science, North Carolina State University, Box 7620, Raleigh, NC 27695-7620
John W. Wilcut
Affiliation:
Department of Crop Science, North Carolina State University, Box 7620, Raleigh, NC 27695-7620
*
Corresponding author's E-mail: [email protected].
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Abstract

Glyphosate effectively controls most weeds in glyphosate-resistant soybean. However, it is sometimes only marginally effective on Ipomoea spp. A field experiment was conducted at five locations in North Carolina to determine the effects of mixing 2,4-DB with glyphosate on Ipomoea spp. control and on soybean injury and yield. The isopropylamine salt of glyphosate at 560, 840, and 1,120 g ai/ha controlled mixtures of tall morningglory, entireleaf morningglory, and red morningglory at least 96% at two locations. Mixing the dimethylamine salt of 2,4-DB at 35 g ae/ha with glyphosate did not increase control but reduced soybean yield 6%. At two other locations, 2,4-DB increased control of tall morningglory and a mixture of entireleaf morningglory and ivyleaf morningglory 13 to 22% when mixed with glyphosate at 560 g/ha, but not when mixed with glyphosate at 840 or 1,120 g/ha. Soybean yield was reduced 31% at one location and was unaffected at the other. At the fifth location, 2,4-DB increased control of tall morningglory 25, 11, and 7% when mixed with glyphosate at 560, 840, and 1,120 g/ha, respectively. Soybean yield was increased 15%. In separate field experiments, glyphosate at 560, 840, and 1,120 g/ha controlled large crabgrass at least 99%. Mixing 2,4-DB at 35 g/ha with glyphosate did not affect control. In the greenhouse, mixing 2,4-DB at 35, 70, 140, or 280 g/ha with glyphosate at 70 to 560 g/ha did not affect large crabgrass control by glyphosate.

Keywords

Glyphosate2,4-DBentireleaf morningglory, Ipomoea hederacea var. integriuscula Gray #3 IPOHGivyleaf morningglory, Ipomoea hederacea (L.) Jacq. # IPOHElarge crabgrass, Digitaria sanguinalis (L.) Scop. # DIGSAred morningglory, Ipomoea coccinea L. # IPOCCtall morningglory, Ipomoea purpurea (L.) Roth # PHBPUsoybean, Glycine max (L.) Merr. ‘Hartz 5566 RR’Herbicide combinationsherbicide interactionsherbicide-resistant cropsWATweeks after treatment
Type
Research
Information
Weed Technology , Volume 15 , Issue 1 , March 2001 , pp. 56 - 61
Copyright
Copyright © Weed Science Society of America 

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