FLUAZIFOP AND QUIZALOFOP, GRASS HERBICIDES, IN COFFEE

Two experiments (nursery and field) were conducted at the Adjuntas sub station during 1990 and 1991 to evaluate fluazifop {(+/-) [2-[4-[[5-(t ri-fluoro-methyl)-2-pyridinyl]oxy] phenoxy]propanoic acid]} and quizal ofop {(+/-)-2-[4[(6-chloro-2-quinoxa(inyl)oxy]phenoxy] propanoic acid} for wood control and phytotoxicity in coffee (Coffea arabia L.). Flua zifop at 0.28 and 1.12 kg ai/ha and quizalofop at 0.22 and 0.90 kg ai/ ha were applied as a postemergence spray. The herbicides at the indica ted rates gave good to excellent control of all grasses present in bot h experiments. No crop injury was noted with either herbicide. The hig hest coffee berry yield of 14,088 kg/ha obtained in plots treated with fluazifop at 1.12 kg ai/ha rate was not significantly different (P = .05) from the lowest yield of (1 0,038 kg/ha) obtained in plots treate d with quizalofop at 0.22 kg ai/ha rate.