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The loss of cyanazine as a post-direct and lay-by material has initiated several studies evaluating currently labeled products and products that the label has expired. Cyanazine was used primarily as a lay-by compound in cotton, and provided the cotton producer with excellent contact activity on many broadleaf and grassy weeds encountered at lay-by, and additionally provided residual control of small seeded grasses and several broadleaf weeds, including morningglory species. Tests were conducted in Tennessee and Texas to evaluate linuron (Linex 4L) as a replacement for cyanazine in a lay-by situation. Review of the properties of linuron indicated promise for the compound to be a viable alternative to cyanazine. Linuron has a comparatively short residual, and additionally has no re-crop restrictions for soybean, corn, rice, or grain sorghum. Comparisons of university published performance data for Linuron place it nearly equal to cyanazine in annual grass control especially when tank mixed with MSMA. Linuron also provides comparable broadleaf weed control when compared to cyanazine, and additionally provides control of 8 -10" hemp sesbaina when applied basally as a post-direct treatment. University of Tennessee data indicate 1.0 lb/A linuron provided 96%
control of morningglory species (pitted and entireleaf) at 7 DAT, while 1.2
lb/A cyanazine provided 97% control, 0.6 lb/A diuron plus 0.3 lb/A linuron
provided 99% control and 2 pt/A Roundup Ultra provided 60% control.
Goosegrass control 14 DAT was 80% with 2 pt/A Roundup Ultra, 50% with Texas A&M data was equally promising. At 7 DAT Diuron at 0.5 lb/A plus Recommended Linex 4L application rates will be 0.75 to 1.5 lb/A
depending on soil type. Linex 4L + Direx 4L tank mix rates will be 0.4 + |
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©National Cotton Council, Memphis TN |
Document last modified XXXXXX, XXX XX 2001
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