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To evaluate importance of paclobutrazol residues on surfaces, begonia  (Begonia semperflorens)  cv. Whisky and chrysanthemum  (Dendranthema grandiflora)  cv. Coral Davis plants were grown in flats sprayed with paclobutrazol at 0, 50, 100, 200 and 400 ppm. For begonia, the plant heights at 2 and 4 weeks after treatments were decreased by 39 to 49% and by 55-69%, respectively. The overall change in height ranged from 2.1 to 4.9 cm compared to 15.3 cm for the control plants. For chrysanthemum, a reduction in plant height was observed and the overall change in height ranged from 2.9 to 5.6 cm compared to 28.8 cm for the control plants. Based on these results, there is a potential for paclobutrazol to affect non-target plants when subirrigation is used.

021 RESPONSE OF BEGONIA AND CHRYSANTHEMUM TOPACLOBUTRAZOL RESIDUES ON SURFACES IN SUBIRRIGATION