Postemergence Polygonum aviculare control in Cynodon dactylon turf

Abstract

Peer-reviewed research is not available to explain Polygonum aviculare L. (prostrate knotweed) control in Cynodon dactylon (bermudagrass) turf, yet P. aviculare is common and troublesome in managed C. dactylon turf. Six experiments were conducted to determine control options for P. aviculare in C. dactylon golf roughs managed in Hanover, VA. Studies evaluated hormone, photosystem, and ALS inhibiting herbicides. Among a group of eighteen herbicide treatments, only six controlled P. aviculare over 80% and these included single products or mixtures containing 2,4-D, dicamba, metsulfuron, or chlorsulfuron. Imazaquin, quinclorac, and triclopyr caused transient C. dactylon injury. Treatments dependent on bromoxynil, triclopyr, clopyralid, quinclorac, metribuzin, rimsulfuron, imazaquin, foramsulfuron, flazasulfuron, trifloxysulfuron sodium, or sulfosulfuron are unlikely to adequately control P. aviculare in C. dactylon turf.

Plant growth regulators differentially suppress goosegrass and smooth crabgrass in creeping bentgrass turf

“…Final assessments of weed control were extrapolated from the line-intersect counts by comparing weed coverage in the nontreated control in each replication versus the coverage in each treated plot. To control for variance structure in repeated measures over time, smooth crabgrass coverage data were transformed to the daily area under the progress curve (AUPC) (Askew et al 2013). The area under the resulting curves was calculated by equation 1:…”