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Title: REDVINE (BRUNNICHIA OVATA) AND TRUMPETCREEPER (CAMPSIS RADICANS) MANAGEMENT IN GLUFOSINATE- AND GLYPHOSATE-RESISTANT SOYBEAN (GLYCINE MAX)

Author
item Reddy, Krishna
item CHACHALIS, DEMOSTHENIS - GREEK AGRL RES FOUNDATION

Submitted to: Weed Technology
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 5/19/2004
Publication Date: 10/1/2004
Citation: Reddy, K.N., Chachalis, D. 2004. Redvine (brunnichia ovata) and trumpetcreeper (campsis radicans) management in glufosinate- and glyphosate-resistant soybean (glycine max). Weed Technology 18:1058-1064.

Interpretive Summary: Redvine and trumpetcreeper are perennial deep-rooted vines found extensively in crop and noncrop lands in the lower Mississippi Delta region. Transgenic soybean resistant to glyphosate and glufosinate provide the flexibility to use these non-selective herbicides to control both weeds within the crop. Scientists at the Southern Weed Science Research Unit in Stoneville, MS, completed field studies to determine the efficacy of glyphosate- and glufosinate-based weed control programs on redvine and trumpetcreeper populations. Glyphosate at 2.52 kg/ha applied preplant reduced density of trumpetcreeper, but not redvine compared with no glyphosate in both glufosinate- and glyphosate-resistant soybean. Glyphosate early postemergence (EPOST) followed by (fb) late postemergence (LPOST) had no effect on density of redvine but reduced density of trumpetcreeper (62%) compared with no herbicide control. There were no differences in densities and dry 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 fb LPOST had no effect on densities, but greatly reduced dry biomass of these vines. These results show that glyphosate preplant and POST applications can reduce density of trumpetcreeper but not redvine, and glufosinate POST applications can suppress growth of both species.

Technical Abstract: Field studies were conducted during 1998-2002 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 about 3 wk before planting soybean did reduce density of trumpetcreeper (45 to 52%), but not redvine compared with no glyphosate in both glufosinate- and glyphosate-resistant soybean. However, glyphosate applied preplant reduced dry biomass of both species in only one of two studies. Glyphosate early postemergence (EPOST) followed by (fb) late postemergence (LPOST) had no effect on density of redvine but reduced density of trumpetcreeper (70%) compared with no herbicide control. There were no differences in densities and dry 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 greatly reduced dry biomass by 45 to 76% and 35 to 58%, respectively, compared with untreated control. These results show that glyphosate preplant and POST applications can reduce density of trumpetcreeper but not redvine, and glufosinate POST applications can suppress growth of both species.