M. A. Batla, J. W. Keeling, P. A. Dotray, and J. D. Everitt. Texas Agricultural Experiment Station, Rt. 3 Box 219, Lubbock, TX 79403
Field experiments were conducted in 2005 at the Texas Agricultural Experiment Station near Lubbock to evaluate ivyleaf morningglory Ipomoea hederacea management in Roundup Ready Flex cotton. Glyphosate was applied at 0.75 and 1.12 lb ae/A alone or in conjunction with either prometryn PRE or pyrithiobac POST. Pyrithiobac POST was compared to glyphosate alone. Glyphosate applications were made at four POST timings beginning at the 2-leaf cotton growth stage, with the last treatment applied at the full bloom cotton growth stage. Improved ivyleaf morningglory control was achieved with glyphosate at 1.12 lbs ae/A compared to glyphosate at 0.75 ae/A. Caporal or pyrithiobac added to glyphosate did not improve morningglory control. Cultivation improved morningglory control when used with the lower rate of glyphosate but did not improve control with the higher glyphosate rate.
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