Table 3: Visual control and fresh weight reduction of common waterhemp population resistant to protox-inhibiting herbicides. Data were collected 21 days after treatment.

Treatment Rate 2002 2003 Control Fresh weight reduction Control Fresh weight reduction     %   Nontreated   0 0 0 0 Flumiclorac-pentyl + COC 30 g ai/ha + 2.3 L/ha 26 64 0 34 Carfentrazone-methyl + NIS 9 g ai/ha + 0.25% v/v 14 57 8 37 Lactofen + COC + DAS 220 + 1.2 L/ha + 2.8 kg/ha 34 49 45 14 Acifluorfen + COC + DAS 420 + 2.3 L/ha + 1.7 kg/ha 46 90 18 17 Fomesafen + COC + UAN 330 + 1% v/v + 2.5% v/v 57 89 20 39 Mesotrione + COC + DAS 110 + 1% v/v + 9.5 kg/ha 99 99 68 72 Dicamba/diflufenzopyr + NIS + DAS 290 + 0.25% v/v + 2.8 kg/ha 72 78 87 83 Atrazine + COC 1680 g ai/ha + 2.3 L/ha 56 100 37 42 LSD ()   23 28 12 42

Abbreviations: DAS: diammonium sulfate ((NH4)2SO4); COC: crop oil concentrate; and NIS: nonionic surfactant; UAN: 28% urea ammonium nitrate.