AbstractThree field experiments were conducted from 1989 to 1990 with transplanted peppers at the Fortuna Substation. In the first and second experiments, six herbicides were evaluated for weed control in cv. Key Largo and cv. Blanco del País, respectively. In the first experiment, clomazone at 1.68 and 3.36 kg ai/ha and fluazifop-P at 0.42 and 0.84 kg ai/ha controlled grasses effectively. The highest pepper yield was obtained from the weeded check plots, followed by those of clomazone at 3.36 kg ai/ha and fluazifop-P plus one supplementary handweeding treatment. In the second experiment, fluazifop-P at 0.84 kg ai/ha plus one handweeding, and fluazifop-P at 0.42 kg ai/ha + bentazon at 2.34 L/ha mixture gave good weed control. With this treatment, peppers outyielded all other herbicide treatments, in the third experiment with cv. Cubanelle, clomazone at either 1.12 or 2.24 kg ai/ha in sequential application with paraquat oi 0.56 kg ai/ha gave excellent control of weeds. Metolachor at 2.24 and 4.46 kg ai/ha in sequential application with paraquat at 0.56 kg ai/ha provided good to excellent control of weeds. The highest pepper yield was obtained with clomazone at 2.24 kg ai/ha in sequential application with paraquat at 0.56 kg ai/ha. This yield was followed closely by that with clomazone at a lower rate in sequential application with paraquat at 0.56 kg ai/ha. Other herbicide treatments, with the exception of oxyfluorfen alone and fluazifop alone also resulted in good pepper yields.
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