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Redvine (Brunnichia ovata) and Trumpetcreeper (Campsis radicans) Management in Glufosinate- and Glyphosate-Resistant Soybean

Published online by Cambridge University Press:  20 January 2017

Krishna N. Reddy  and
Demosthenis Chachalis
Krishna N. Reddy*
Affiliation:
Southern Weed Science Research Unit, United States Department of Agriculture, Agricultural Research Service, P.O. Box 350, Stoneville, MS 38776
Demosthenis Chachalis
Affiliation:
Southern Weed Science Research Unit, United States Department of Agriculture, Agricultural Research Service, P.O. Box 350, Stoneville, MS 38776
*
Corresponding author's E-mail: kreddy@ars.usda.gov
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Abstract

Three field studies were conducted during 1998 to 2002 at Stoneville, MS, to examine the efficacy of glufosinate and glyphosate on redvine and trumpetcreeper control in glufosinate- and glyphosate-resistant soybean. Glyphosate at 2.52 kg ae/ha applied approximately 3 wk before planting soybean reduced trumpetcreeper density (45 to 52%) but not redvine compared with no glyphosate in both glufosinate- and glyphosate-resistant soybean. However, glyphosate applied preplant reduced biomass of both species in glufosinate-resistant soybean. Glyphosate early postemergence (EPOST) followed by (fb) late postemergence (LPOST) had no effect on redvine density but reduced trumpetcreeper density (70%) compared with the no-herbicide control. There were no differences in densities and biomass of redvine and trumpetcreeper and soybean yield among isopropylamine, diammonium, and aminomethanamide dihydrogen tetraoxosulfate salts of glyphosate. Overall, trumpetcreeper is more susceptible to glyphosate than redvine. Glufosinate EPOST with or without acifluorfen or glufosinate EPOST fb LPOST had no effect on densities of redvine and trumpetcreeper but reduced biomass 45 to 76% and 35 to 58%, respectively, compared with the nontreated control. These results show that glyphosate preplant and POST in-crop applications can reduce trumpetcreeper density but not redvine, and glufosinate POST applications can suppress growth of both species.

Keywords

Acifluorfenclomazoneglufosinateglyphosatelactofenredvine, Brunnichia ovata (Walt.) Shinners #3 BRVCIsoybean, Glycine max (L.) Merr. ‘DP4690 RR’, ‘DP 5806 RR’, ‘AG 4702 RR’, ‘A 5547 LL’trumpetcreeper, Campsis radicans (L.) Seem. ex Bureau # CMIRAGlyphosate formulationperennial vinetransgenic soybeanweed biomassweed densityAdt, aminomethanamide dihydrogen tetraoxosulfateDia, diammoniumEPOST, early postemergencefb, followed byIpa, isopropylamineLPOST, late postemergencePOST, postemergencePRE, preemergenceWAP, weeks after planting soybeanWAT, weeks after late postemergence.
Type
Research
Information
Weed Technology , Volume 18 , Issue 4 , December 2004 , pp. 1058 - 1064
Copyright
Copyright © Weed Science Society of America 

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