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Glufosinate Tolerance of Multiple WideStrike and Liberty‐Link Cotton ( Gosspyium hirsutum L.) Cultivars
Author(s) -
Sweeney J. A.,
Jones M. A.
Publication year - 2015
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci2014.03.0175
Subject(s) - glufosinate , cultivar , lint , biology , agronomy , fiber crop , sowing , yield (engineering) , horticulture , malvaceae , glyphosate , materials science , metallurgy
One option available to cotton ( Gosspyium hirsutum L.) producers for control of glyphosate [ N ‐(phosphonomethyl)glycine]–resistant (GR) weeds is the use of glufosinate [(2 RS )‐2‐amino‐4‐[hydroxy(methyl)phosphinoyl]butyric acid] (Liberty 280SL, 24.5% [w/v] glufosinate‐ammonium salt) in glufosinate‐tolerant, transgenic cotton cultivars. A field experiment conducted in 2011 and 2012 in Florence, SC, examined the effects of glufosinate on the growth, lint yield, and fiber quality of WideStrike and Liberty‐Link cotton cultivars. Five WideStrike cultivars and three Liberty‐Link cultivars were sprayed topically at the 1‐ to 3‐leaf stage and the 7‐ to 9‐leaf stage with glufosinate at 0.59 kg ha −1 . Glufosinate‐ and weed‐free plots were maintained as controls for each cultivar. Reduced plant health and increased leaf injury were observed in both Liberty‐Link and WideStrike cultivars following glufosinate applications, but sprayed WideStrike cultivars displayed as much as 11% greater leaf injury than sprayed Liberty‐Link cultivars. No differences in lint yield were found between sprayed WideStrike or Liberty‐Link cultivars and their respective controls. However, averaged across all cultivars, lint yield of cotton sprayed with glufosinate was 105 kg ha −1 greater than unsprayed cotton. Yield increases of sprayed cotton appeared to be related to increased boll production at the first fruiting position and between nodes 11 and 15. Glufosinate had no effect on any fiber property evaluated. Cotton producers planting WideStrike or Liberty‐Link cotton cultivars and using glufosinate at labeled rates can adequately control GR weeds without negatively affecting lint yield or fiber quality. Cotton producers may also possibly experience slight lint yield increases as a result of glufosinate application in WideStrike and Liberty‐Link cotton cultivars.