Several preemergent herbicides were compared for control of the warm season annuals Phyllanthus urinaria and P. tenellus. Approximately 55 seeds per species were applied to each 3.8-liter container filled with a pine bark:Canadian sphagnum peat:sand medium (3:1:1, by vol.; initial pH = 5.6). The six treatments (including untreated pots), with four replications per treatment and three pots per r...