9090 Cotton and Weed Response to Propazine / Glyphosate Postemergence Combinations

Thursday, January 8, 2009: 8:45 AM
Salon M (Marriott Rivercenter Hotel)
K. S. Verett, J. W. Keeling and P. A. Dotray, Texas AgriLIFE Research, Lubbock, TX
Cotton tolerance and weed management studies were conducted in 2007 & 2008 on Roundup Ready Flex Cotton on the Texas Southern High Plains.  Propazine was applied alone and in combination with glyphosate at three rates and three different timings.  Application timings were made preplant, 2-3 leaf, and 5-6 leaf growth stage.  Weeds species evaluated included Palmer Amaranth, and ivyleaf morningglory.  Weed control ratings were taken after each application and end of season, and cotton harvested and data analyzed.  Propazine offered improved residual control of Palmer amaranth and morningglory.  Cotton yields were not affected by any propazine treatment.