CARROT (DAUCUS-CAROTA) AND WEED RESPONSE TO LINURON AND METRIBUZIN APPLIED AT DIFFERENT CROP STAGES

Redroot pigweed and common lambsquarters control was variable within a nd between seasons when postemergence linuron and metribuzin were appl ied one or two times at below-labeled rates to one-, three-, or five-l eaf carrots, A single, low-rate application of either herbicide at the one- or three-leaf stage of carrots failed to provide adequate season -long broadleaf weed control, Two low-rate applications to either one- + three- or three- + five-leaf carrots significantly improved control , Linuron produced little or no injury to carrots regardless of applic ation timing, Metribuzin-induced injury was variable initially and dec reased to 10% or less by 14 d after treatment, One application of eith er linuron or metribuzin resulted in reduced yields of carrots.