Abstract
Abstract Plants of 4 azalea cultivars which remained in a greenhouse with 18°C minimum temperature from last pinch through flowering and received 18-hour photoperiods (LD) following 6, 8, or 10 weeks of 9-hour photoperiods (SD) flowered 2 to 7 weeks earlier than plants cold-stored at 3°C for 5 weeks following 12 weeks of SD. Flowering of cvs. Red Wing, Alaska, and Gloria was hastened more by LD treatment than by 5 weekly applications of 1000 ppm gibberellic acid (GA3), whereas flowering of ‘Chimes’ was affected about equally by these 2 factors. Flowering was most uniform with cold-storage, but plants of all cultivars except ‘Chimes’ were well covered with flowers following all treatments. Percentage of flowers open at one time increased as SD exposure increased from 6 to 10 weeks and that of ‘Chimes’ was increased by GA3 treatment. Vegetative bypassing varied more among cultivars than among treatments. Pedicels of ‘Alaska’ and ‘Chimes’ flowers on plants with LD treatment without GA3 were shorter than those on cold-treated plants, whereas those with LD plus GA3 were longer. Succinic acid-2, 2-dimethylhydrazide (SADH) at 3000 ppm delayed flowering of non-cold-treated plants of ‘Red Wing’, ‘Alaska’, and ‘Gloria’.
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