Submitted to: Agronomy Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 10/23/1998
Publication Date: N/A
Technical Abstract: By understanding the nature of seedling emergence and seed production of grass weeds growing in spring wheat (Triticum aestivum) production systems, producers can tailor management practices to minimize competition from grass weeds and costs associated with their management. Emergence patterns of foxtails (Setaria spp.)growing in wheat were studied from 1994 to 1997, and foxtail seed production was studied in 1996 and 1997. Foxtail percentage emergence and population density was highest when wheat was seeded early in the season. However, foxtail densities were reduced with a postemergence application of fenoxaprop and 2,4-D and MCPA regardless of seeding date of wheat. Post-harvest foxtail seed production was reduced by greater than 70 percent when glyphosate was applied within two weeks following wheat harvest. Foxtail emergence patterns and seed production did not differ greatly among tillage regimes (moldboard plow, chisel plow, and no-till) though foxtail populations were highest in no till. This study provides information on weed biology that can be used in an integrated approach to weed management, and can be the basis for the development of a decision aid for grass weed management in wheat production systems.