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Terri Woods Starman and P.T. Gibson

The effectiveness of uniconazole for height control of Hypoestes (Hypoestes phyllostachya Bak. `Pink Splash') was determined, and the persistence of uniconazole with chlormequat and daminozide for limiting stem elongation in a low-light interior environment was compared. Spray and drench applications of uniconazole decreased plant height linearly with increased concentration. Two uniconazole sprays at 5.0 mg·liter -1, 0.05 mg a.i./pot uniconazole drench, or two chlormequat sprays at 2500 mg·liter-1 resulted in equally aesthetic plant size for 0.4-liter pots. Chlormequat was more effective than uniconazole for reducing rate of growth in the postharvest environment. No difference in postproduction rate of growth occurred between two sprays at 5.0 mg·liter-1 and 0.05 or 0.10 mg a.i./pot drench treatments of uniconazole. Chemical names used: 2-chloro -N,N,N- trimethylethanaminium chloride (chlormequat chloride); butanedioic acid mono(2,2-dimethylhydrazide) (daminozide); (E)-(S) -1-(4-chlorophenyl)-4,4-dimethyl-2-(1,2,4-triazol-1-yl)-pent-l1ene-3-ol (uniconazole).