Monday, November 13, 2006

Annual Bluegrass Seedhead Suppression with Bispyribac-Sodium and Plant Growth Regulators.

Patrick Mccullough, Rutgers Univ., 59 Dudley Rd, 59 Dudley Rd, New Brunswick, NJ 08901, United States of America and Stephen Hart, Foran Hall, 59 Dudley Rd., Rutgers State University Accounts Payable, Rutgers University, Department of Plant Biology & Pathology, New Brunswick, NJ 08901.

Field experiments were conducted in spring 2005 and 2006 to evaluate efficacy of bispyribac-sodium (BS) for annual bluegrass seedhead control in New Jersey.  Applying BS before annual bluegrass seedhead emergence at 37 or 74 g/ha gave temporary control but was not as effective as ethephon plus trinexapac-ethyl (TE).  Sequential applications of BS were most effective in controlling seedheads after emergence but annual bluegrass chlorosis was only acceptable (< 20%) when applied with chelated iron.  Overall, BS has potential to control annual bluegrass seedheads after emergence but ethephon plus trinexapac-ethyl gave most consistent control when applied before seedhead emergence.