BARNYARDGRASS (ECHINOCHLOA-CRUS-GALLI) CONTROL IN DRY-SEEDED RICE (ORYZA-SATIVA) WITH SOIL-APPLIED AND POSTEMERGENCE HERBICIDE PROGRAMS

A study was conducted from 1994 through 1996 to evaluate barnyardgrass control, rice yield, and estimated economic returns with delayed pree mergence (DPRE) applications of pendimethalin, quinclorac, thiobencarb , pendimethalin plus quinclorac, and pendimethalin plus thiobencarb ap plied alone or followed by postemergence (POST) applications of propan il or propanil plus molinate. Late-season barnyardgrass control with p endimethalin plus quinclorac was greater than with pendimethalin, quin clorac, thiobencarb, or pendimethalin plus thiobencarb. Control with p endimethalin, quinclorac, and pendimethalin plus thiobencarb exceeded that with thiobencarb. Propanil plus molinate controlled barnyardgrass more effectively than propanil. Quinclorac and pendimethalin plus qui nclorac were the only DPRE herbicide treatments where yield and estima ted economic returns were not improved by POST herbicides.